Knotty problem with our land (7)
I believe the answer is:
nodular
'knotty' is the definition.
(thesaurus)
'problem with our land' is the wordplay.
'problem' is an anagram indicator.
'with' says to put letters next to each other.
'our'+'land' is 'ourland'.
'ourland' with letters rearranged gives 'NODULAR'.
(Other definitions for nodular that I've seen before include "Like a small swelling" , "Lumpy" , "Having small lumps" , "Knotted" , "With small swellings" .)