Traveller’s means of contact crossing headland going north (9)
I believe the answer is:
passenger
'traveller's' is the definition.
(passenger is a kind of traveller)
'of contact crossing headland going north' is the wordplay.
'of contact' becomes 'pager' (I can't explain this - if you can you should give a lot more credence to this answer).
'crossing' means one lot of letters goes inside another (to cross can mean to go over or around).
'headland' becomes 'ness' (both can mean a promontory).
'going north' is a reversal indicator.
'ness' written backwards gives 'ssen'.
'pager' placed around 'ssen' is 'PASSENGER'.
'means' acts as a link.
Can you help me to learn more?
(Other definitions for passenger that I've seen before include "Traveller in a vehicle driven by someone else" , "He's being taken for a ride" , "One on a train perhaps" , "One travelling" , "one transferred by coach, perhaps" .)