Being awfully urbane, Abel finds this to be insufferable (10)
I believe the answer is:
unbearable
'this to be insufferable' is the definition.
(thesaurus)
'being awfully urbane abel' is the wordplay.
'being awfully' is an anagram indicator.
'urbane'+'abel'='urbaneabel'
'urbaneabel' anagrammed gives 'UNBEARABLE'.
'finds' is the link.
(Other definitions for unbearable that I've seen before include "it's just too much!" , "Insupportable" , "Intolerable" .)