Three wise men not in line (7)
I believe the answer is:
maginot
'line' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'three wise men not' is the wordplay.
'three wise men' becomes 'magi' (I've seen this before).
'magi'+'not'='MAGINOT'
'in' is the link.
Can you help me to learn more?
(Other definitions for maginot that I've seen before include "French war minister after whom a defensive line was named" , "Defensive line in World War II" , "Fr. World War two defensive line" .)