Measure that is of help to a sportsman (6)
I believe the answer is:
gillie
'measure that is of help to a sportsman' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'measure that is' is the wordplay.
'measure' becomes 'gill' (gill is a kind of measure).
'that is' becomes 'ie' (abbreviation for id est, 'that is' in Latin).
'gill'+'ie'='GILLIE'
Can you help me to learn more?
(Other definitions for gillie that I've seen before include "Hunter's aide" , "guide for anglers" , "Attendant on a Scottish hunting, shooting or fishing trip" , "Assistant to an angler" , "Scottish attendant to hunter or fisherman" .)