Crossword Genius

A cereal obtained from a tree? (5)

Ross

I believe the answer is:

acorn

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'a tree?' is the definition.
The answer and definition can be both plants as well as being singular nouns.
Perhaps there's a link between them I don't understand?

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

'obtained from' is the link.

Can you help me to learn more?

(Other definitions for acorn that I've seen before include "Might source" , "Dirt on a liquid surface" , "form of seeding" , "Potential oak" , "From which a mighty oak may grow?" .)

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