Back in the day (4)

I think it could be either:

Which length description are you looking for?:

4* 5,3

'back in the day' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for once that I've seen before include "in bygone days" , "Previously" , "in days of yore?" , "in bygone era" , "Cone (anag.)" .)

I've seen this clue in the Universal, The Mirror, the LA Times and The New York Times.

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