Looking for more nuts, first off (5)
I believe the answer is:
after
'looking for' is the definition.
(I've seen this before)
'more nuts first off' is the wordplay.
'more nuts' becomes 'dafter' ('daft' can be a synonym of 'nuts').
'first off' means to remove the first letter.
'dafter' with its initial letter taken off is 'AFTER'.
(Other definitions for after that I've seen before include "In the time following" , "Subsequently" , "Coming later in time" , "Behind; seeking" , "Post, later than" .)