Crossword Genius

A pass back (3)

Ross

I believe the answer is:

ago

'back' is the definition.
('years back' means 'years ago')

'a pass' is the wordplay.
'pass' becomes 'go' (synonyms).
'a'+'go'='AGO'

(Other definitions for ago that I've seen before include "In past times" , "Back (in time)" , "Gone, past, since" , "Time past" , "Previously" .)

I've seen this clue in The Times.
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