Dollar leap (4)
I believe the answer is:
buck
This clue is a double definition.
'dollar' is the first definition.
(I've seen this before)
'leap' is the second definition.
(thesaurus)
(Other definitions for buck that I've seen before include "Dollar (slang)" , "Blood < money" , "Antelope - dollar" , "A slangy American dollar, may be fast" , "Spirited male" .)