Home for hermit in Home Counties — like Hades (8)
I believe the answer is:
seashell
'home for hermit' is the definition.
(potential home for a hermit crab)
'home counties like hades' is the wordplay.
'home counties' becomes 'se'.
'like' becomes 'as'.
'hades' becomes 'hell' ('Hell' can be a synonym of 'hades').
'se'+'as'+'hell'='SEASHELL'
'in' acts as a link.
(Other definitions for seashell that I've seen before include "Case of mollusc" , "scallop?" , "hermits abode" , "periwinkle?" , "Empty covering of marine mollusc" .)