Line from man he ties at sea (9)
I believe the answer is:
mainsheet
'line' is the definition.
(mainsheet is a kind of line)
'man he ties at sea' is the wordplay.
'at sea' indicates an anagram.
'man'+'he'+'ties'='manheties'
'manheties' is an anagram of 'MAINSHEET'.
'from' is the link.
(Other definitions for mainsheet that I've seen before include "Nautical rope" , "Some tackle" , "One adjusts canvas" , "shipping line" , "Sailors' rope" .)