Not a fair result, that’s definite! (5)

I believe the answer is:

fixed

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

'definite' is the definition.
('fixed' can be a synonym of 'definite')

I can't explain the remainder of the clue.

(Other definitions for fixed that I've seen before include "Repaired" , "Securely fastened" , "Established" , "Arranged" , "Set" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app