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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 whole clue is the definition (& lit or double definition).
How the clue works
This is a double definition where both halves point to BUCK UP. Become encouraged is the everyday sense of buck up, while dollar gaining value plays on buck meaning a dollar and up suggesting it's rising in worth.