What rarely leads to action in a way unknown (6)
I believe the answer is:
apathy
'what rarely leads to action' is the definition.
I can't judge whether this definition defines the answer.
'a way unknown' is the wordplay.
'way' becomes 'path' (path is a kind of way).
'unknown' becomes 'y' (algebra).
'a'+'path'+'y'='APATHY'
'in' is the link.
Can you help me to learn more?
(Other definitions for apathy that I've seen before include "Torpor" , "lack of involvement" , "Absence of interest or emotion" , "Lack of emotion and enthusiasm" , "Disinclination to shift" .)