Crossword Genius

Obstinate but brainy? (10)

Ross

I believe the answer is:

headstrong

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

This clue could be a double definition.

'obstinate' is the first definition.
(I've seen this before)

'brainy?' is the second definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?

'but' acts as a link.

Can you help me to learn more?

(Other definitions for headstrong that I've seen before include "obstinately self-willed" , "Wilfully determined" , "Obstinate" , "strong-willed" , "Obstinately rash" .)

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