Deciding badger's home is next to heather (8)
I believe the answer is:
settling
'deciding' is the definition.
('settle' can be a synonym of 'decide')
'badger's home is next to heather' is the wordplay.
'badger's home' becomes 'sett' (I've seen this before).
'is next to' is a charade indicator (letters next to each other).
'heather' becomes 'ling' ('ling' can be a synonym of 'heather').
'sett'+'ling'='SETTLING'
(Other definitions for settling that I've seen before include "Coming to mutually agreeable terms" , "Coming to terms or becoming established" , "Coming to rest or paying a bill" , "Gradually sinking to a lower level" , "Sorting out" .)