I sail on anyhow as intermediary (7)
I believe the answer is:
liaison
'intermediary' is the definition.
(I've seen this before)
'i sail on anyhow' is the wordplay.
'anyhow' is an anagram indicator.
'i'+'sail'+'on'='isailon'
'isailon' is an anagram of 'LIAISON'.
'as' is the link.
(Other definitions for liaison that I've seen before include "Connection - relationship" , "An affair or mediation" , "Mil. coordination; illicit affair" , "Mediator" , "Intermediary" .)