Crossword Genius

Chap in a smash up (3)

Ross

I believe the answer is:

sam

'chap' is the definition.
(man's name)

'in a smash up' is the wordplay.
'in' indicates the answer is hidden within the clue.
'up' says the letters should be written in reverse (in down clue: letters go upwards).
'mas' can be found hidden inside 'smash'.
'mas' backwards is 'SAM'.

(Other definitions for sam that I've seen before include "together once" , "Casablanca piano player" , "Uncle" , "Boy" .)

I've seen this clue in the Evening Standard.
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