Fanatical about braid (5)
I believe the answer is:
rabid
'fanatical' is the definition.
(I know that fanatical can be written as rabid)
'about braid' is the wordplay.
'about' indicates anagramming the letters.
'braid' with letters rearranged gives 'RABID'.
(Other definitions for rabid that I've seen before include "Frenzied" , "Mad; raging" , "Ferocious" , "Extremely fanatical" , "extremist" .)