Crossword Genius

After month, a large transfer (5)

Ross

I believe the answer is:

decal

'transfer' is the definition.
(design transferred onto a surface)

'after month a large' is the wordplay.
'after' means one lot of letters go next to another.
'month' becomes 'dec' (abbreviation for December).
'large' becomes 'L' (eg in clothes sizes).
'dec'+'a' is 'deca'.
'deca'+'l'='DECAL'

(Another definition for decal that I've seen is " Transfer - laced (anag)".)

I've seen this clue in The Daily Express.
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