Huntsman has to go by lake (4)
I believe the answer is:
peel
'huntsman' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'to go by lake' is the wordplay.
'to go' becomes 'pee' (both can mean to urinate).
'by' means one lot of letters go next to another.
'lake' becomes 'L' (geographical abbreviation).
'pee'+'l'='PEEL'
'has' acts as a link.
Can you help me to learn more?
(Other definitions for peel that I've seen before include "See 4 and 22" , "PM once; remove skin" , "A PM; a fortified tower" , "island" , "Outer fruit layer" .)