Annoyed and looking embarrassed about one left (5)
I believe the answer is:
riled
'annoyed' is the definition.
('rile' can be a synonym of 'annoy')
'looking embarrassed about one left' is the wordplay.
'looking embarrassed' becomes 'red' (I've seen this before).
'about' means one lot of letters goes inside another.
'one' becomes 'li' (I've seen this in other clues**).
'left' shows that the letters should be reversed in order.
'li' written backwards gives 'il'.
'red' enclosing 'il' is 'RILED'.
'and' is the link.
(Other definitions for riled that I've seen before include "Cross" , "Annoyed" , "Vexed" , "Irritated, provoked" , "Nettled" .)