Retrain teen performing as a comic, perhaps (11)
I believe the answer is:
entertainer
'a comic perhaps' is the definition.
(comic is a kind of entertainer)
'retrain teen performing' is the wordplay.
'performing' is an anagram indicator.
'retrain'+'teen'='retrainteen'
'retrainteen' anagrammed gives 'ENTERTAINER'.
'as' acts as a link.
(Other definitions for entertainer that I've seen before include "Performer" , "One who amuses" , "Eg, singer or comic" , "One in showbusiness" , "One providing hospitality" .)