Return of actor in epic, or performing ... (13)
I believe the answer is:
reciprocation
'return' is the definition.
(reciprocation is a kind of return)
'actor in epic or performing' is the wordplay.
'performing' indicates an anagram.
'actor'+'in'+'epic'+'or'='actorinepicor'
'actorinepicor' with letters rearranged gives 'RECIPROCATION'.
'of' is the link.
(Other definitions for reciprocation that I've seen before include "Mutual giving and receiving - cop in race riot (anag)" , "returning the same gestures?" , "Giving, in return" .)