Manage fine conclusion (4)
I believe the answer is:
fend
'manage' is the definition.
(I've seen this before)
'fine conclusion' is the wordplay.
'fine' becomes 'f' (abbreviation).
'conclusion' becomes 'end' (end is a kind of conclusion).
'f'+'end'='FEND'
(Other definitions for fend that I've seen before include "Ward off from offender" , "Manage (usually for oneself)" , "Try to manage without help" , "Ward (off); manage (for oneself)" .)