To experience again, changing sides for comfort (6)
I believe the answer is:
revive
'comfort' is the definition.
(thesaurus)
'to experience again changing sides' is the wordplay.
I cannot quite see how this works, but
'again' could be 're' and 're' is located in the answer.
The remaining letters 'vive' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'for' acts as a link.
Can you help me to learn more?
(Other definitions for revive that I've seen before include "(Cause to) get new life" , "Rally" , "Come to life again" , "bring round" , "Restore or return to life" .)