Down with longing for one’s familiar environs Eskimo travels around Canada at first after end of lunch (8)
I believe the answer is:
homesick
'down with longing' is the definition.
'homesick' can be an answer for 'longing' (thesaurus). I'm not sure about the 'down with' bit.
'one's familiar environs eskimo travels around canada at first after end of lunch' is the wordplay.
I cannot quite understand how this works, but
'one's' could be 'mes' (a setter might use 'one' to humourously mean 'me') and 'mes' is found within the answer.
'around' could be 'o' (I've seen this in other clues) and 'o' is located in the answer.
'first' could be 'i' (I in Roman numerals eg Elizabeth I) and 'i' is present in the answer.
This explanation may well be incorrect...
'for' is the link.
Can you help me to learn more?
(Other definitions for homesick that I've seen before include "Feeling sadness when away from family etc" , "Missing one's normal environment" , "I shock me (anag.)" , "Nostalgic" , "Unhappy away" .)