Unmatched one-way ticket (6)
I believe the answer is:
single
This clue might be a double definition.
'unmatched' is the first definition.
Both the answer and definition are adjectives. Perhaps there's a link between them I don't understand?
'one-way ticket' is the second definition.
(I've seen this before)
Can you help me to learn more?
(Other definitions for single that I've seen before include "A hit for one run in cricket" , "Concentrating on only one aim" , "Not one of several" , "Solo" , "Unattached" .)