Crossword Genius

A place of one's mind? (5,4)

Ross

I believe the answer is:

brain cell

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

'a place of one's mind?' is the definition.
I can't tell whether this definition defines the answer.

'place of one's mind?' is the wordplay.
I cannot really see how this works, but
'place' could be 'cell' (I have seen 'Place of confinement ' mean 'cell' so perhaps 'place' could also mean 'cell') and 'cell' is present in the answer.
'mind?' could be 'brain' ('brain' can be a synonym of 'mind') and 'brain' is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for brain cell that I've seen before include "Thinking unit?" , "Thoughtful unit" .)

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