Crossword Genius

A cat -- ounce? (4)

Ross

I believe the answer is:

atom

'ounce?' is the definition.
(thesaurus)

'a cat' is the wordplay.
'cat' becomes 'tom' (a tom is a male cat).
'a'+'tom'='ATOM'

(Other definitions for atom that I've seen before include "A tiny powerful particle" , "Moat (anag.)" , "A small but mighty particle" , "Very small bit" , "Nucleus surrounded" .)

I've seen this clue in The Telegraph.
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