Irritable idler wandering around ruined temple (3-8)
I believe the answer is:
ill-tempered
'irritable' is the definition.
(synonyms)
'idler wandering around ruined temple' is the wordplay.
'wandering' is an anagram indicator.
'around' means one lot of letters goes inside another.
'ruined' indicates an anagram.
'idler' is an anagram of 'ilred'.
'temple' is an anagram of 'ltempe'.
'ilred' enclosing 'ltempe' is 'ILL-TEMPERED'.
(Other definitions for ill-tempered that I've seen before include "chippy" , "Irritable" .)