Stone used to make a badger's home (4)
I believe the answer is:
sett
I believe this is a double definition.
'stone' is the first definition.
(I know that sett is a type of paving stone)
'a badger's home' is the second definition.
(term for a badger's home)
'used to make' acts as a link.
(Other definitions for sett that I've seen before include "habitat" , "paving stone" , "Badgers' lair" , "Underground 10 [HOUSE]" , "Badger's residence" .)