Brain child? (5)

I believe the answer is:

bairn

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

'child?' is the definition.
(Scottish and northern English term for a child)

'brain' is the wordplay.
'brain' can be anagrammed to 'BAIRN'.
But, I'm not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for bairn that I've seen before include "Scots child" , "Scot. child" , "Kid" , "Child (of the North!)" , "Northern child" .)

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.