After host split, harries cook for stuffing (9)
I believe the answer is:
horsehair
'stuffing' is the definition.
(I have seen 'Good stuffing' mean 'horsehair' so perhaps 'stuffing' could also mean 'horsehair')
'after host split harries cook' is the wordplay.
I cannot really understand how this works, but
an anagram of 'harries' is 'rsehair' which is within the answer.
The remaining letters 'ho' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'for' is the link.
Can you help me to learn more?
(Other definitions for horsehair that I've seen before include "substance, stranded" , "From Arab perhaps" , "this may provide us with many strings to our bow" , "upholsterer's material" , "Natural fabric used in stuffing upholstery" .)