Embarrassing woman's noted performance in golf (13)
I believe the answer is:
disconcerting
'embarrassing' is the definition.
(synonyms)
'woman's noted performance in golf' is the wordplay.
'woman's' becomes 'di's' (short for Diana).
'noted performance' becomes 'concert' (performance with musical notes).
'golf' becomes 'g' (phonetic alphabet: alpha, bravo, charlie etc.).
'dis'+'concert'+'in'+'g'='DISCONCERTING'
(Other definitions for disconcerting that I've seen before include "Unsettling" , "Off-putting" , "Causing one to feel unsettled" , "Worrying" , "Causing unease" .)