Blushing, having nothing to perform again (4)
I believe the answer is:
redo
'perform again' is the definition.
('do' can be a synonym for 'perform' so perhaps 'redo' is OK for 'perform again')
'blushing having nothing' is the wordplay.
'blushing' becomes 'red' (I've seen this before).
'having nothing' becomes 'o' (I've seen this in other clues).
'red'+'o'='REDO'
'to' acts as a link.
(Other definitions for redo that I've seen before include "Perform (action) again" , "Fashion again" , "Carry out again" , "Redecorate or repeat action" , "Make anew" .)