Airmen’s assembly for group discussion (7)
I believe the answer is:
seminar
'group discussion' is the definition.
(I've seen this before)
'airmen's assembly' is the wordplay.
'assembly' indicates an anagram.
'airmens' is an anagram of 'SEMINAR'.
'for' acts as a link.
(Other definitions for seminar that I've seen before include "Teaching meeting, conference" , "Training meeting" , "University discussion" , "Meeting for exchange of ideas" , "Symposium" .)