Work over taking sexy snap (5)
I believe the answer is:
photo
'snap' is the definition.
(thesaurus)
'work over taking sexy' is the wordplay.
'work' becomes 'op' (abbreviation for opus**).
'over' is a reversal indicator.
'taking' is an insertion indicator.
'sexy' becomes 'hot' ('hot' can be similar in meaning to 'sexy').
'op' in reverse letter order is 'po'.
'po' going around 'hot' is 'PHOTO'.
(Other definitions for photo that I've seen before include "Camera image" , "This race finish is very close" , "Snap (abbrev.)" , "Snap, pic" , "Snap - shot" .)