Crossword Genius

Nothing sinister about tree (5)

Ross

I believe the answer is:

olive

'tree' is the definition.
(olive tree is a kind of tree)

'nothing sinister about' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'sinister' becomes 'evil' (similar in meaning).
'about' says the letters should be written in reverse.
'evil' back-to-front is 'live'.
'o'+'live'='OLIVE'

(Other definitions for olive that I've seen before include "Bitter fruit" , "woman" , "Greyish-green; fruit" , "Yellowish-green - fruit" , "Girl's name - colour" .)

I've seen this clue in The Telegraph.
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