Heart of crew stuck together in post break-up period (7)
I believe the answer is:
rebound
'together in post break-up period' is the definition.
I can't tell whether this defines the answer.
'heart of crew stuck' is the wordplay.
'heart of' means to look at the middle letters.
'stuck' becomes 'bound' ('bind' can be a synonym of 'stick').
The central letters of 'crew' are 're'.
're'+'bound'='REBOUND'
Can you help me to learn more?
(Other definitions for rebound that I've seen before include "Backfire" , "be resilient" , "recover" , "Come straight back" , "misfire" .)