Crossword Genius

Give the game away? A clumsy greengrocer might (5,3,5)

Ross

I believe the answer is:

spill the beans

'give the game away?' is the definition.
(I've seen this before)

'a clumsy greengrocer might' is the wordplay.
I cannot really understand how this works, but
'a' could be 'an' and 'an' is found within the answer.
This may be the basis of clue (or it may be nonsense).

(Other definitions for spill the beans that I've seen before include "Let the cat out of the bag" , "Reveal secret information" , "Blurt out secret" , "Grass" , "Explain" .)

I've seen this clue in The Times.
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