1: Principal on top of leafy tree (5)
4: Oil depots destroyed ocean habitats (4,5)
9: Send back gangster's gun to get ID (3)
10: Perhaps men sit and eat in a cafe (9)
11: We hear sniffer is acquainted with the facts (5)
13: Administered dose of vitamin (between 100 and 1000) in head (7)
14: Was pertinent Associated Press page misrepresented? (7)
16: Climactic age opal tossed (7)
17: Tits are flying birds (7)
19: Bound her, as subject, to a government official (7)
21: Running across obscene libation from the East Texas town? (7)
23: Supplementing oriental ruler (5)
24: Supporting truth nearly buried in con game (9)
26: One may be transported by this kiss, it's said (3)
27: Cad mad about Dutch port (9)
28: Run around near a stadium (5)