Adopt a pseudonym to cover exploits (4)
I believe the answer is:
taps
'exploits' is the definition.
(to tap is to exploit or make use of something)
'adopt a pseudonym to cover' is the wordplay.
'to cover' says the answer is hidden in the clue (I've seen 'covering' mean this).
'TAPS' is hidden in the letters of 'adopt a pseudonym'.
(Other definitions for taps that I've seen before include "They're faucets in America" , "Knocks lightly on the faucets" , "Thread cutters' strikes" , "Exploits" , "Military bugle call at dusk" .)