A dollar for it sounds dear (4)

I believe the answer is:

buck

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'a dollar' is the definition.
(slang)

I cannot understand how the remainder of the clue works.

(Other definitions for buck that I've seen before include "US cash" , "A slangy American dollar, may be fast" , "Stag" , "type of vaulting-horse" , "Male beast" .)

I've seen this clue in The Globe and Mail.

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