Crossword Genius

You can get water at the Boar's Head, one thinks (5)

Ross

I believe the answer is:

brain

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

'head one thinks' is the definition.
'brain' can be an answer for 'head' (head can mean someone's brain or intellect). I am not certain of the 'one thinks' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for brain that I've seen before include "Intellectual ability" , "Hit hard; intellect" , "The grey matter" , "Intellectual capacity" , "Thinking thing" .)

I've seen this clue in the Evening Standard.
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