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