She's in the pool (5)
I believe the answer is:
kitty
This clue is a double definition.
'she's' is the first definition.
'pool' is the second definition.
(both can mean a shared fund)
'in the' acts as a link.
(Other definitions for kitty that I've seen before include "Cat; fund of money" , "Pool - puss" , "Pool - 4 down" , "Pool - Katharina?" , "potential winnings" .)