Tolerate animal (4)
I believe the answer is:
bear
This clue is a double definition.
'tolerate' is the first definition.
(synonyms)
'animal' is the second definition.
(I know that bear is a type of animal)
(Other definitions for bear that I've seen before include "Tolerate; animal" , "Press (on) - approach threateningly" , "Carry; large animal" , "See 13 across" , "Support, large mammal" .)