What we hope to make after joining the party? (5)

I believe the answer is:

merry

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'party?' is the definition.
Both the definition and answer are adjectives. Maybe you can see a link between them that I can't see?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for merry that I've seen before include "Convivial" , "Old King Cole was a ..... old soul" , "Lively -- slightly drunk" , "Joyous, cheerful" , "Mistresses Page and Ford of Windsor" .)

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

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