Flipping veteran sneakily conceals trap (7)
I believe the answer is:
ensnare
'trap' is the definition.
(I've seen this before)
'flipping veteran sneakily conceals' is the wordplay.
'flipping' says the letters should be written backwards.
'conceals' indicates the answer is hidden within the clue.
'eransne' can be found hidden inside 'veteran sneakily'.
'eransne' in reverse letter order is 'ENSNARE'.
(Other definitions for ensnare that I've seen before include "Capture, trap" , "Ambush" , "Ecstatic expression of feeling" , "Catch as if in a trap or net" .)