Goes, some say, for wily scheme (6)
I believe the answer is:
wheeze
'wily scheme' is the definition.
(wheeze can mean a scheme or trick)
'goes some say' is the wordplay.
'goes' becomes 'wees' (go can mean to urinate).
'some say' shows a homophone (sound like).
'wees' is a homophone of 'WHEEZE'.
'for' is the link.
(Other definitions for wheeze that I've seen before include "Cunning scheme (informal)" , "Cunning plan (informal)" , "Clever scheme; sound asthmatic" , "Breathe with hoarse whistling sound" , "A good trick" .)