Ad-lib in group, primarily during comedy (4,2)
I believe the answer is:
wing it
'ad-lib' is the definition.
(I've seen this in another clue)
'in group primarily during comedy' is the wordplay.
'primarily' says to take the initial letters.
'during' indicates putting letters inside.
'comedy' becomes 'wit' (I can't explain this - if you can you should give a lot more credence to this answer).
The initial letter of 'group' is 'g'.
'in'+'g'='ing'
'ing' placed within 'wit' is 'WING IT'.
Can you help me to learn more?
(Other definitions for wing it that I've seen before include "Perform without any preparation" , "Improvise" .)