Holiday couple a Venetian takes in (5)
I believe the answer is:
leave
'holiday' is the definition.
(I've seen this before)
'couple a venetian takes in' is the wordplay.
'in' says the answer is hidden in the clue.
'LEAVE' can be found hidden inside 'couple a venetian takes'.
(Other definitions for leave that I've seen before include "Relinquish - holiday" , "Time off; go" , "Don't take - time off" , "taken by those on the way out" , "Permission to go; allow to remain" .)