Crossword Genius

A cat scrap (4)

Ross

I believe the answer is:

atom

'scrap' is the definition.
(I've seen this before)

'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 "Tiny particle, great bomb" , "Small particle of matter" , "Moat (anag.)" , "Minute fragment" , "Elementary particle" .)

I've seen this clue in The Telegraph and The Globe and Mail.
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