Sailor having many chats at sea (9)
I believe the answer is:
yachtsman
'sailor' is the definition.
(I know that sailor can be written as yachtsman)
'many chats at sea' is the wordplay.
'at sea' is an anagram indicator.
'many'+'chats'='manychats'
'manychats' with letters rearranged gives 'YACHTSMAN'.
'having' acts as a link.
(Other definitions for yachtsman that I've seen before include "Member of sailing crew" , "crafty person" , "Male sailor" , "Description of Chichester" , "Ainslie, for example" .)