Crossword Genius

Cuff that is small and round (4)

Ross

I believe the answer is:

slap

'cuff' is the definition.
(I know that cuff is a more specific form of the action slap)

'small and round' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'and' is a charade indicator (letters next to each other).
'round' becomes 'lap' (as in a round or lap of a park).
's'+'lap'='SLAP'

'that is' acts as a link.

(Other definitions for slap that I've seen before include "Strike action" , "Hit with an open hand" , "Sharp smack" , "Strike (in the face)" , "Cuff" .)

I've seen this clue in The Times and The Sunday Times.
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