About to call European dignitary embarrassing (12)
I believe the answer is:
cringeworthy
'embarrassing' is the definition.
(cringeworthy can mean very embarrassing)
'about to call european dignitary' is the wordplay.
I cannot quite see how this works, but
'about' could be 'c' (abbreviation for 'circa') and 'c' is found within the answer.
'call' could be 'ring' (telephone call) and 'ring' is located in the answer.
'european' could be 'e' (abbreviation e.g. EU) and 'e' is found within the answer.
'dignitary' could be 'worthy' (I've seen this before) and 'worthy' is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
(Other definitions for cringeworthy that I've seen before include "Severely embarrassing" , "Acutely embarrassing" , "Causing embarrassment" .)