Said to establish a place for the badgers (4)
I believe the answer is:
sett
'a place for the badgers' is the definition.
I can't tell whether this defines the answer.
'said to establish' is the wordplay.
'said' indicates a 'sounds like' (homophone) clue.
'to establish' becomes 'set' (setting is a kind of establishing).
'set' is a homophone of 'SETT'.
Can you help me to learn more?
(Other definitions for sett that I've seen before include "habitat" , "Badger's earth" , "Badgers' lair" , "Test for a badger's burrow" , "Retreat" .)