It's said to accompany a will from home (4)
I believe the answer is:
away
'will from home' is the definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?
'it's said to accompany a' is the wordplay.
'it's said' becomes 'way' (I can't explain this - if you can you should give a lot more credence to this answer).
'to accompany' means one lot of letters go next to another.
'way' after 'a' is 'AWAY'.
Can you help me to learn more?
(Other definitions for away that I've seen before include "Not present, having left" , "Away in the distance" , "(Of sports fixture) at opponents' ground" , "Absent, gone" , "At a distance; match" .)