A win in a wagon (4)

I believe the answer is:

wain

'a wagon' is the definition.
(I know that wain is a type of wagon)

'a win in' is the wordplay.
'in' indicates putting letters inside.
'a' going inside 'win' is 'WAIN'.

(Other definitions for wain that I've seen before include "Wagon, cart" , "Hay cart" , "Waggon (arch)" .)

I've seen this clue in the Evening Standard.

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