Money has left conflict (5)
I believe the answer is:
clash
'conflict' is the definition.
(I know that clash is a type of conflict)
'money has left' is the wordplay.
'money' becomes 'cash' (cash is a type of money).
'has' indicates putting letters inside.
'left' becomes 'l' (common abbreviation).
'cash' enclosing 'l' is 'CLASH'.
(Other definitions for clash that I've seen before include "Conflict; be incompatible" , "(Of colours) look inappropriate together" , "Mismatch" , "Come into violent conflict" , "Collision (of colour)" .)