Horrid to rent out (6)
I believe the answer is:
rotten
'horrid' is the definition.
(thesaurus)
'to rent out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'to'+'rent'='torent'
'torent' is an anagram of 'ROTTEN'.
(Other definitions for rotten that I've seen before include "Lousy" , "Decayed or detestable" , "Decayed or despicable" , "Corrupt; very bad" , "Decayed or morally corrupt" .)