Overplay a role (5)
I believe the answer is:
emote
'overplay a role' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for emote that I've seen before include "Go over the top" , "Exaggerate one's feelings" , "Show strong feelings" , "Show feeling excessively" , "Show exaggerated feelings" .)