One who has recently joined a union (5-3)

I believe the answer is:

newly-wed

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'one who' is the definition.
The definition suggests an adjective which matches the answer.

'recently joined a union' is the wordplay.
'recently' becomes 'newly' (synonyms).
'joined a union' becomes 'we'd' (I've seen this in another clue).
'newly'+'wed'='NEWLY-WED'

'has' acts as a link.

Can you help me to learn more?

(Another definition for newly-wed that I've seen is " Person only just married".)

I've seen this clue in The Telegraph.

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