Somewhat disliked, a mean pantomime character (4)
I believe the answer is:
dame
'pantomime character' is the definition.
(I've seen this before)
'somewhat disliked a mean' is the wordplay.
'somewhat' says the answer is hidden in the clue.
'DAME' is hidden within 'disliked a mean'.
(Other definitions for dame that I've seen before include "Female title; panto part" , "Female equivalent of a knight" , "That ain't no lady'" , "Pantomime role played by a man" , "Woman" .)