Flowing ocean chaos claims 50 (8)
I believe the answer is:
seamless
'flowing' is the definition.
(flowing without visible transitions)
'ocean chaos claims 50' is the wordplay.
'ocean' becomes 'sea' (synonyms).
'chaos' becomes 'mess' (I've seen this before).
'claims' is an insertion indicator.
'50' becomes 'l' (Roman numeral).
'mess' enclosing 'l' is 'mless'.
'sea'+'mless'='SEAMLESS'
(Other definitions for seamless that I've seen before include "Without apparent joins" , "Without obvious joins" , "Showing no joins" , "Unbroken" , "Showing no join" .)