Renting isn't a problem if obstinate (12)
I believe the answer is:
intransigent
'obstinate' is the definition.
(thesaurus)
'renting isn't a problem' is the wordplay.
'problem' is an anagram indicator.
'renting'+'isnt'+'a'='rentingisnta'
'rentingisnta' with letters rearranged gives 'INTRANSIGENT'.
'if' acts as a link.
(Other definitions for intransigent that I've seen before include "Stubborn" , "Irreconcilable" , "Hardliner" , "unwilling to compromise" , "becomes immovable" .)