You don't mention which section of Clement, but since Rockit is in the lower Ave's, I'll assume you mean from Arguello to ~9th. Also, you probably wanted input for last night, but oh well :)
My favorites in that area (mostly already mentioned) are:
Burma Superstar - will be horribly busy on a Sat night, tho
Mandalay - should be much less busy than Burma Superstar, and the food's comparable
Brothers - excellent Korean BBQ (don't bother w/anything else there). Be warned that you'll smell of smoke all night, and service can be brusque.
Minh's Garden - good Vietnamese dive
Mai's Kitchen - less dive'y Vietnamese, but still pretty inexpensive
Troya - great Turkish food, and underappreciated, IMO
Clementine - nice mid-range French bistro fare
Q - solid comfort food, service isn't always what one would hope, though
I agree w/Meggie - Troya would be my pick for the reasons mentioned. Since you're time-constrained, I wouldn't recommend Burma Superstar or Brothers, since AFAIK neither takes reservations and both will be very crowded on a Sat night.
126 Clement St, San Francisco, CA 94118
4344 California St, San Francisco, CA 94118
Brothers 2 Restaurant
4014 Geary Blvd, San Francisco, CA 94118
225 Clement St, San Francisco, CA 94118
Mai's Vietnamese Restaurant
316 Clement St, San Francisco, CA 94118
My favorites, besides some that have been mentioned are Cafe Troya (Mediterranean/Turkish), Le Soleil (upscale Vietnamese), Minh's (divey Vietnamese), and Giorgio's for pizza (I like the thin crust). Out of all these, I would go to Troya - great food that is hard to get elsewhere in the city.
208 Clement St, San Francisco, CA 94118
Le Soleil Authentic Vietnamese
133 Clement St, San Francisco, CA 94118
151 Clement St, San Francisco, CA 94118
349 Clement Street, San Francisco, CA 94118
"Q" is a nice, casual option, with great comfort/American food. It's on Clement, between 3rd and 4th.
Pizza Orgasmica on Clement at 10th
Burma SuperStar on Clement at 3rd
B Star Bar on Clement at 2nd??
Brothers Restaurant (Korean) on Geary at 6th
Chin Bistro (Sushi) on California at 6th
Coriya Hot Pot City on Clement at 10th (cook your own food)
Burma Superstar is always great - Just make sure to get there early and put your name in. They'll take down your cell # and call you when your table is ready, so you can grab a drink or a coffee while you wait.
Spices 2 on 6th has excellent spicy szechuan.
Burma Superstar Restaurant
309 Clement St, San Francisco, CA 94118
291 6th Ave, San Francisco, CA 94118