Crossword Genius

Two options for gambler to make pair out of singleton? (3,6)

Ross

I believe the answer is:

see double

'to make pair out of singleton?' is the definition.
(seeing double is seeing two of a single thing)

I don't understand how the remainder of the clue works.

(Other definitions for see double that I've seen before include "Drunks might well" , "experience an illusion" , "Observe two of everything" .)

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