Youngster accepting help having fulfilled financial obligations (4-2)

I believe the answer is:

paid-up

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'fulfilled financial obligations' is the definition.
The answer and definition are different parts of speech. However, adjectives and past participle verbs can occasionally mean the same thing.

'youngster accepting help' is the wordplay.
'youngster' becomes 'pup' (a pup is a young dog).
'accepting' means one lot of letters goes inside another (inserted letters are accepted).
'help' becomes 'aid' (synonyms).
'pup' enclosing 'aid' is 'PAID-UP'.

'having' is the link.

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I've seen this clue in The Guardian.

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