Tom's mate? (5)
I believe the answer is:
tabby
'tom's mate?' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tabby that I've seen before include "Mottled and striped grey or brownish cat" , "Streaked cat" , "Cat with grey or brown streaks or patches" , "Brownish-grey cat" , "Brownish cat with dark streaks" .)