Put up with a dull fellow (4)
I believe the answer is:
bore
I believe this is a double definition.
'put up with' is the first definition.
(past tense of 'bear')
'a dull fellow' is the second definition.
(I've seen this in another clue)
(Other definitions for bore that I've seen before include "... endured" , "Wearisome person" , "Pierce - weary - tidal flood" , "Carried - drill" , "Capable of being shifted" .)