One who's always springing for things, for short? (3)

I believe the answer is:

roo

(Other definitions for roo that I've seen before include "Jumping marsupial" , "Australian jumper" , "Aussie jumper!" , "Small inhabitant of Hundred Acre Wood" , "Kanga's son (Pooh)" .)

I've seen this clue in The New York Times.

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