Crossword Genius

Tree potentially has a grain (5)

Ross

I believe the answer is:

acorn

'tree potentially' 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'

'has' acts as a link.

(Other definitions for acorn that I've seen before include "from which something bigger may develop" , "form of seeding" , "oak's fruit" , "Fruit of the oak tree" , "From which a tall tree may grow" .)

I've seen this clue in The Sun.
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