Fanatical about braid (5)
I believe the answer is:
rabid
'fanatical' is the definition.
(synonyms)
'about braid' is the wordplay.
'about' indicates anagramming the letters.
'braid' is an anagram of 'RABID'.
(Other definitions for rabid that I've seen before include "Frenzied" , "Mad; raging" , "Ferocious" , "Extremely fanatical" , "extremist" .)