Muse of comedy (6)
I believe the answer is:
thalia
'muse of comedy' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for thalia that I've seen before include "Grace" , "Greek Muse of comedy" , "Inspiring female" , "Aha, lit up one of the three Graces of Greek mythology" , "source of artistic inspiration" .)