Crossword Genius

Old woman's hot brew (4)

Ross

I believe the answer is:

mash

'brew' is the definition.
(I've seen this before)

'old woman's hot' is the wordplay.
'old woman's' becomes 'mas' (belongs to ma).
'hot' becomes 'h' (abbreviation eg on taps).
'mas'+'h'='MASH'

(Other definitions for mash that I've seen before include "Crush, potatoes say" , "dish of veg" , "Forces hospital" , "Brew or infuse (tea)" , "Sham sort of pulp" .)

I've seen this clue in the Independent.
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