Tolerate mug (11)
I believe the answer is:
countenance
I believe this clue is a double definition.
'tolerate' is the first definition.
(thesaurus)
'mug' is the second definition.
(both can mean a face)
(Other definitions for countenance that I've seen before include "A person's face; admit as possible" , "Favour" , "features" , "Accept as possible; face" , "appearance" .)