Hard to love dilapidated pigsty (5)
I believe the answer is:
hovel
'pigsty' is the definition.
(thesaurus)
'hard to love dilapidated' is the wordplay.
'hard' becomes 'h' (abbreviation used in pencil classifications).
'to' says to put letters next to each other.
'dilapidated' indicates an anagram.
'love' with letters rearranged gives 'ovel'.
'h'+'ovel'='HOVEL'
(Other definitions for hovel that I've seen before include "Shack" , "Mean dwelling" , "Small crude shelter" , "Grubby tumbledown dwelling" , "Ramshackle dwelling" .)