Make fun of butt during first half of meal (4,2)
I believe the answer is:
send up
'make fun of' is the definition.
(I've seen this before)
'butt during first half of meal' is the wordplay.
'butt' becomes 'end' (eg the butt or end of a cigarette).
'during' is an insertion indicator.
'first half of meal' becomes 'sup' (I've seen this in other clues).
'end' going inside 'sup' is 'SEND-UP'.
(Other definitions for send up that I've seen before include "Mockery" , "Make fun of, parody" , "Mock?" , "Spoof - jail" , "Supply from below; lampoon" .)