Crossword Genius

A grain seed (5)

Ross

I believe the answer is:

acorn

'seed' is the definition.
(I've seen this before)

'a grain' is the wordplay.
'grain' becomes 'corn' (corn is a kind of grain).
'a'+'corn'='ACORN'

(Other definitions for acorn that I've seen before include "Fruit of the oak tree" , "From which a mighty oak may grow?" , "From which a "tall oak" may grow" , "From which a tall tree may grow" , "Model in stone" .)

I've seen this clue in The Times.
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