Six of the unclued entries (one of three words, three of two words and one hyphened; all in Chambers apart from one name; unchecked letters can spell ACTOR OR WOMEN ETC ARE CHIEF SUSPECT) share a connection which will allow the other two to be deduced.
 

Across

 
9 Apparently overdrawn, and without a leg to stand on? (4)
11 Metal band twisted into antenna on the top of a building? (10)
14 A poster in the capital of Vietnam’s summer palace (6)
16 Old saw (5)
17 Took great steps to abridge editor (5)
20 Old plants initially tossed into filthy ash-can (7)
21 Feudal tenant taking half-dollar...