Pool made by a cat? (5)
I believe the answer is:
kitty
This clue is a double definition.
'pool' is the first definition.
('kitty' can be a synonym of 'pool')
'a cat?' is the second definition.
(kitty is a kind of cat)
'made by' acts as a link.
(Other definitions for kitty that I've seen before include "Jack" , "Pool - puss" , "Pot of money" , "Young domestic pet" , "Collection of money" .)