Double jackpot winner collects (4)

I believe the answer is:

twin

I'm a little stuck... Click here to teach me more about this clue!

'double' is the definition.
(thesaurus)

'jackpot winner collects' is the wordplay.
'TWIN' is hidden within the letters.
However, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for twin that I've seen before include "eg Pollux or Remus" , "Castor or Pollux?" , "Family member" , "English poet" , "One of two duplicates" .)

I've seen this clue in The Telegraph.

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