Just single (4)

I believe the answer is:

only

This clue is a double definition.

'just' is the first definition.
(synonyms)

'single' is the second definition.
(synonyms)

(Other definitions for only that I've seen before include "And no one else" , "Except that; single" , "Siblingless (child)" , "Merely; single" , "Simply" .)

I've seen this clue in The Guardian.

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