Crossword Genius

On reflection, a must as a fruit (7)

Ross

I believe the answer is:

satsuma

'fruit' is the definition.
(satsuma is a kind of fruit)

'on reflection a must as a' is the wordplay.
'on reflection' says the letters should be written in reverse.
'must'+'as'='mustas'
'mustas' in reverse letter order is 'satsum'.
'satsum'+'a'='SATSUMA'

(Other definitions for satsuma that I've seen before include "Loose-skinned tangerine" , "Japanese province and small orange" , "Loose-skinned fruit" , "Seasonal orange" , "sort of orange" .)

I've seen this clue in The Globe and Mail.
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