Crossword Genius

He makes mum cross (3)

Ross

I believe the answer is:

max

'he' is the definition.

'mum cross' is the wordplay.
'mum' becomes 'ma' (ma can mean mother).
'cross' becomes 'x' (X is cross-shaped).
'ma'+'x'='MAX'

'makes' is the link.

(Another definition for max that I've seen is " The greatest".)

I've seen this clue in the Evening Standard.
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