Crossword Genius

A duck lives on fruit (6)

Ross

I believe the answer is:

olives

'fruit' is the definition.

'a duck lives on' is the wordplay.
'a duck' becomes 'o' (resembles zero - 'duck' in cricket).
'on' is a charade indicator (letters next to each other).
'o'+'lives'='OLIVES'

(Other definitions for olives that I've seen before include "Yellowish green fruits" , "Trees grown for their oil-producing fruit" , "'Oddly, I loves these fruits (6)'" , "Fruits from the tree of peace" , "Small green stone fruits, nice in cocktails" .)

I've seen this clue in the Evening Standard.
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