Crossword Genius

Cut down part of the sum owing (3)

Ross

I believe the answer is:

mow

'cut down' is the definition.
('mow' can be a synonym of 'cut down')

'part of the sum owing' is the wordplay.
'part of' says the answer is hidden in the clue.
'MOW' can be found hidden inside 'sum owing'.

(Other definitions for mow that I've seen before include "'Cut down, hay, say (3)'" , "'Cut, grass say (3)'" , "Cut grass or grain" , "Cut grass on lawn" , "Cut down, usually grass" .)

I've seen this clue in the Evening Standard.
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