Catherine earmarked money for cat (5)
I believe the answer is:
kitty
I believe this is a triple definition!
'catherine' is the first definition.
(Kitty can be short for Catherine)
'earmarked money' is the second definition.
(kitty can mean a fund for something)
'for cat' is the third definition.
(informal term for a cat)
(Other definitions for kitty that I've seen before include "Pool of bets in gambling" , "One part of litter queen dropped" , "19 - diminutive name for girl or pet" , "Communal funds" , "Common pool of money" .)