Distance unit (3,4)
There are a few possibilities for this:
sea mile
'distance unit' is the definition.
(I know that foot is a type of distance unit)
This is all the clue.
(Other definitions for foot that I've seen before include "See 24" , "12 inches" , "Unit of length" , "Infantry - unit of linear measure" , "Labour Party leader, 1980-83" .)
'distance unit' is the definition.
(I know that mile is a distance unit)
This is all the clue.
(Other definitions for mile that I've seen before include "5280 feet" , "'A miss is as good as a ....'" , "Stretch of road" , "1.61km" , "Distance race" .)
(Other definitions for sea mile that I've seen before include "unit of distance" , "Nautical distance" .)