Money for a large animal (5)
I believe the answer is:
rhino
This clue is a double definition.
'money' is the first definition.
(old-fashioned slang term for money)
'for a large animal' is the second definition.
(short for rhinoceros)
(Other definitions for rhino that I've seen before include "Moola" , "Hi, Ron, this animal is abbreviated" , "Funds" , "When provoked, one may charge" , "One with a very thick skin (abbr)" .)