Crossword Genius

Nothing is fruit (6)

Ross

I believe the answer is:

olives

I'm a little stuck... Click here to teach me more about this clue!

'nothing is fruit' is the definition.
I can't tell whether this defines the answer.

'nothing is' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'is' becomes 'lives'.
'o'+'lives'='OLIVES'

Can you help me to learn more?

(Other definitions for olives that I've seen before include "Small green Mediterranean tree fruits" , "The fruits are important source of oil" , "Small tree-fruits - so live" , "Trees grown for their oil-producing fruit" , "Small green stone fruits, nice in cocktails" .)

I've seen this clue in The Guardian.
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