Eight furlongs (3-4)
'eight furlongs' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for mile that I've seen before include "1.61km" , "Imperial length" , "Eight furlongs" , "'A miss is as good as a ....'" , "Unit of distance" .)
'eight furlongs' is the definition.
(I've seen this in another clue)
This is all the clue.