Armistice in fierce sea conflict (9)
I believe the answer is:
ceasefire
'armistice' is the definition.
I know nothing about this answer so I can't tell whether this works.
'fierce sea conflict' is the wordplay.
'conflict' is an anagram indicator (I've seen 'conflicting' mean this (conflicting can mean confusing or unclear)).
'fierce'+'sea'='fiercesea'
'fiercesea' with letters rearranged gives 'CEASEFIRE'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for ceasefire that I've seen before include "Truce" , "Break in fighting" .)