Rural cuts affected outside temperature of a building (10)
I believe the answer is:
structural
'a building' is the definition.
(thesaurus)
'rural cuts affected outside temperature' is the wordplay.
'affected' is an anagram indicator.
'outside' is an insertion indicator (some letters go outside others).
'temperature' becomes 't' (abbreviation).
'rural'+'cuts'='ruralcuts'
'ruralcuts' anagrammed gives 'sructural'.
'sructural' placed around 't' is 'STRUCTURAL'.
'of' acts as a link.
(Other definitions for structural that I've seen before include "Concerned with building" , "Relating to framework" , "Relating to frame of a building" .)