Mum's hot potatoes (4)

I believe the answer is:

mash

'potatoes' is the definition.
(mashed potato)

'mum's hot' is the wordplay.
'mum's' becomes 'ma's' (ma can mean mother).
'hot' becomes 'h' (abbreviation, eg on taps).
'mas'+'h'='MASH'

(Other definitions for mash that I've seen before include "(Crush into) pulp" , "Soft, pulpy mass" , "Accompaniment of bangers" , "Forces hospital" , "Pummel" .)

I've seen this clue in the Evening Standard.

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