Swamp leveraged, perhaps (9)
I believe the answer is:
everglade
'swamp' is the definition.
(thesaurus)
'leveraged perhaps' is the wordplay.
'perhaps' indicates an anagram.
'leveraged' anagrammed gives 'EVERGLADE'.
(Other definitions for everglade that I've seen before include "Swamp (in Florida, e.g.)" , "stretch of marshy grassland" , "nickname of US State" .)