Pantomime character's spotted dog (9)
I believe the answer is:
harlequin
This might be a double definition.
'pantomime character's' is the first definition.
(I've seen this before)
'spotted dog' is the second definition.
'harlequin' can be an answer for 'dog' (I've seen this before). I'm not sure about the 'spotted' bit.
Can you help me to learn more?
(Other definitions for harlequin that I've seen before include "Pantomime character in a tight spangled costume" , "Spotted dog < with clown" , "Pantomime character with Columbine - rugby player" , "Commedia dell'arte clown" , "Brightly-coloured - Columbine's partner in pantomime" .)