Poet’s a big hit (5)
I believe the answer is:
homer
I believe this is a double definition.
'poet's' is the first definition.
(Homer is an example)
'a big hit' is the second definition.
(I've seen this in another clue)
(Other definitions for homer that I've seen before include "Blind man" , "Greek poet - TV's Simpson" , "Bird" , "messenger of war?" , "pigeon, maybe" .)