They seriously think hip-hop losers will regroup (12)

I believe the answer is:

philosophers

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'they' is the definition.
Both the answer and definition are plural nouns.
Maybe there's a link between them I don't understand?

'seriously think hip-hop losers will regroup' is the wordplay.
'hip-hop losers' anagrams to 'PHILOSOPHERS'.
Though, I am not sure how the anagram is indicated.

Can you help me to learn more?

I've seen this clue in The Times.

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