Looking embarrassed, I had performed again (5)
I believe the answer is:
redid
'performed again' is the definition.
('did' can be a synonym for 'performed' so perhaps 'redid' is OK for 'performed again')
'looking embarrassed i had' is the wordplay.
'looking embarrassed' becomes 'red' (someone may go red when embarrassed).
'i had' becomes 'i'd' (contraction).
'red'+'id'='REDID'
(Other definitions for redid that I've seen before include "Made over" , "Performed again" , "Freshly decorated" , "tried again" , "Again prepared" .)