Come to rest on the seat (6)
I believe the answer is:
settle
I believe this clue is a double definition.
'come to rest' is the first definition.
(I've seen this before)
'the seat' is the second definition.
(settle is a kind of seat)
'on' is the link.
(Other definitions for settle that I've seen before include "Decide - pay for - square - bench" , "Arrange; colonise" , "rest > put in order" , "Come to rest or decide an argument" , "Resolve or precipitate" .)