A turn in the past (3)

I believe the answer is:

ago

'in the past' is the definition.
(three years ago means three years in the past)

'a turn' is the wordplay.
'turn' becomes 'go' (a person's move in a board game).
'a'+'go'='AGO'

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

I've seen this clue in The Times and The Mirror.

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