Mischievous bairn, but with intellect (5)

I believe the answer is:

brain

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

'intellect' is the definition.
(brain is a kind of intellect)

'mischievous bairn but' is the wordplay.
'bairn' can be anagrammed to 'BRAIN'.
Though, I am not sure how the anagram is indicated.

'with' is the link.

Can you help me to learn more?

(Other definitions for brain that I've seen before include "Seat of the intellect" , "Whack on the head" , "The grey matter" , "Mind" , "Intellectual capacity" .)

I've seen this clue in the Evening Standard.

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