Awkward bra, anger miss with fumbling (12)
I believe the answer is:
embarrassing
'awkward' is the definition.
('embarrassing' can be a synonym of 'awkward')
'bra anger miss with fumbling' is the wordplay.
'with fumbling' indicates anagramming the letters.
'bra'+'anger'+'miss'='braangermiss'
'braangermiss' is an anagram of 'EMBARRASSING'.
(Other definitions for embarrassing that I've seen before include "Socially very awkward" , "Humiliating" , "Ticklish" , "Blush-making" , "Causing one to feel awkward" .)