Stop terribly rude bore (7)
I believe the answer is:
endured
'bore' is the definition.
(bear can mean to endure)
'stop terribly rude' is the wordplay.
'stop' becomes 'end' (synonyms).
'terribly' is an anagram indicator.
'rude' with letters rearranged gives 'ured'.
'end'+'ured'='ENDURED'
(Other definitions for endured that I've seen before include "Red nude (anag.)" , "Withstood" , "Borne" , "Bore; put up with" , "Put up with something" .)