Crossword Genius

A grain in wood perhaps (5)

Ross

I believe the answer is:

acorn

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

'wood perhaps' is the definition.
I can't tell whether this defines the answer.

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

'in' acts as a link.

Can you help me to learn more?

(Other definitions for acorn that I've seen before include "Model in stone" , "cup's content" , "Tree seed" , "old computer?" , "from which something bigger may develop" .)

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