Puts on a happy face (6)
I believe the answer is:
smiles
'puts on a happy face' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for smiles that I've seen before include "Gives visible sign of pleasure" , "Shows signs of pleasure or amusement" , "Facial expressions showing pleasure" , "expresses pleasure" , "Beams, grins" .)