Ace hit hard makes you embarrassed (7)
I believe the answer is:
abashed
'embarrassed' is the definition.
('abash' can be a synonym of 'embarrass')
'ace hit hard' is the wordplay.
'ace' becomes 'a'.
'hit hard' becomes 'bashed' (I've seen this before).
'a'+'bashed'='ABASHED'
'makes you' acts as a link.
(Other definitions for abashed that I've seen before include "Confounded" , "turned red?" , "Had base (anag.)" , "Feeling uneasy" , "Embarrassed or ashamed" .)