Time long past (4)
I believe the answer is:
yore
'time long past' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for yore that I've seen before include "Time long past" , "Long ago (literary)" , "Old usage for formerly, as in days of. . ." , "Archaic word for long ago" , "Bygone time" .)