Model again getting embarrassed over nothing (4)
I believe the answer is:
redo
'model again' is the definition.
(to redecorate or remodel)
'embarrassed over nothing' is the wordplay.
'embarrassed' becomes 'red' (I've seen this before).
'over' says to put letters next to each other.
'nothing' becomes 'o' (looks like zero - 0).
'red'+'o'='REDO'
'getting' is the link.
(Other definitions for redo that I've seen before include "Create again" , "Decorate (eg a room) again" , "Start again" , "Perform (action) again" , "Make anew" .)