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1 Across, Tail of Flying Fortress initially eliminated as cause of trouble for airmen (7)

5 Across, Coarse stuff from two males (7)

12 Across, Born perhaps as result of incest - it's shocking (9)

14 Across, Be last to get raises,having introduced most of them (5,2,3,4)

Many thanks

5 buck ram (tough material)

1 gremlin
(flyin)g ( k)remlin

1a: gremlin = cause of trouble for airmen (see Chambers)
g- (flyin)g
(K) remlin- fortress

Sorry, JG - was checking in Chambers in middle of typing!

12a: scientist - anagram of "incest its"

14a bring up the rear

Many thanks to all.