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Become
encouraged
as
dollar
gaining
value
(4,2)
Become encouraged as dollar gaining value (4,2)
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The definition is at the beginning of the clue.
How the clue works
Right, so Become encouraged is your definition — that's cheering up, taking heart. For the wordplay, take BUCK (that's slang for a dollar) and stick UP after it, since "gaining value" is just a nice way of saying something's rising — pop them together and you're there.