Unmarried? That may be a record (6)
I believe the answer is:
single
This clue is a double definition.
'unmarried?' is the first definition.
('single' can be similar in meaning to 'unmarried')
'a record' is the second definition.
(thesaurus)
'that may be' is the link.
(Other definitions for single that I've seen before include "Unaccompanied" , "One-way ticket" , "Ticket To Ride < : > hit" , "Individual - unmarried" , "Sole" .)