Crossword Genius

Rail ticket still on the shelf (6)

Ross

I believe the answer is:

single

This clue is a double definition.

'rail ticket' is the first definition.

'still on the shelf' is the second definition.
(without a partner)

(Other definitions for single that I've seen before include "Individual - unmarried" , "Concentrating on only one aim" , "Unique" , "Unattached" , "Not one of several" .)

I've seen this clue in The Guardian.
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