Gathered in a gym, looking embarrassed about it? (6)
I believe the answer is:
reaped
'gathered' is the definition.
(reaping is a kind of gathering)
'a gym looking embarrassed about it?' is the wordplay.
'gym' becomes 'pe' (short for Physical Education).
'looking embarrassed' becomes 'red' (I've seen this before).
'about it?' means one lot of letters goes inside another.
'a'+'pe'='ape'
'ape' going within 'red' is 'REAPED'.
'in' is the link.
(Other definitions for reaped that I've seen before include "Gathered, harvested" , "Gleaned like harvest" .)