Alcoholic in bed was embarrassed (7)
I believe the answer is:
blushed
'embarrassed' is the definition.
Although both the answer and definition are past participle verbs, I can't see how one could define the other.
'alcoholic in bed' is the wordplay.
'alcoholic' becomes 'lush' (synonyms).
'in' indicates putting letters inside.
'lush' put within 'bed' is 'BLUSHED'.
'was' is the link.
Can you help me to learn more?
(Other definitions for blushed that I've seen before include "Went red" , "Turned red with embarrassment" .)