Jack’s partner going topless, a provocation making you embarrassed (3,2,4)
I believe the answer is:
ill at ease
'embarrassed' is the definition.
(I've seen this before)
'jack's partner going topless a provocation' is the wordplay.
'jack's partner' becomes 'jill' (as in the nursery rhyme Jack and Jill).
'going topless' means to remove the first letter.
'provocation' becomes 'tease' (tease can mean a provocative person).
'jill' with its initial letter removed is 'ill'.
'ill'+'a'+'tease'='ILL-AT-EASE'
'making you' acts as a link.
(Other definitions for ill at ease that I've seen before include "Embarrassed" , "Nervous, uncomfortable" , "Unsettled, anxious" , "Elite, alas? (Anag)" , "Unsure and constrained in manner" .)