Come down with post for remote Cornish location (5,3)
I believe the answer is:
lands end
'remote cornish location' is the definition.
(most westerly point of England)
'come down with post' is the wordplay.
'come down' becomes 'land' (to land is to come down after flying).
'with' says to put letters next to each other.
'post' becomes 'send' (synonyms).
'land'+'send'='LANDS END'
'for' is the link.
(Other definitions for lands end that I've seen before include "From extremely English place" , "head in Cornwall - with 8d" , "next stop America?" , "Other extreme from 12" , "Westernmost tip of Cornwall" .)