Ace party? Shame! (5)

I believe the answer is:
abash
Here is my best explanation:
'shame' is the definition.
(thesaurus)
'ace party?' is the subsidiary indication.
'ace' becomes 'a'.
'party?' becomes 'bash' (bash is a kind of party**).
'a'+'bash'='abash'
(Other definitions for abash that I've seen before include "Cause to feel 4", "Make embarrassed or ashamed", "Affront", "Disconcert", "Humiliate", "Strike with embarrassment", "Discomfit", "Cause to feel ashamed", "Cause someone to feel embarrassed" and "Embarrass".)

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