Tolerate rude fellow (4)
I believe the answer is:
bear
This clue is a double definition.
'tolerate' is the first definition.
(synonyms)
'rude fellow' is the second definition.
(I've seen this before)
(Other definitions for bear that I've seen before include "Show" , "Support; brutish person" , "Relating to charged particles" , "Put up with - beast!" , "Tolerate; animal" .)