Route requiring soft touch to enter ferry harbour at first (6,4)
I believe the answer is:
flight path
'route' is the definition.
(I know that flight path is a type of route)
'soft touch to enter ferry harbour at first' is the wordplay.
'soft' becomes 'light' (synonyms).
'touch' becomes 'pat' (pat is a kind of touch).
'to enter' indicates putting letters inside.
'at first' says to take the initial letters.
The first letters of 'ferry harbour' is 'fh'.
'light'+'pat'='lightpat'
'lightpat' inserted within 'fh' is 'FLIGHT PATH'.
'requiring' is the link.
(Other definitions for flight path that I've seen before include "that was fatal for Icarus" , "Escape route" , "followed by Galileo, for instance" , "Escape road" .)