Unready king making girl embarrassed (8)
I believe the answer is:
ethelred
'unready king' is the definition.
(I've seen this in another clue)
'girl embarrassed' is the wordplay.
'girl' becomes 'ethel' (I've seen this before).
'embarrassed' becomes 'red' (someone may blush or go red when embarrassed).
'ethel'+'red'='ETHELRED'
'making' acts as a link.
(Other definitions for ethelred that I've seen before include "Unready monarch" , "King nicknamed the Unready" , "Old king" , "Alfred the Great's brother and predecessor, d. 871 -- the elder (anag)" , ""Unready" English king" .)