Decent chalet I designed (7)
I believe the answer is:
ethical
'decent' is the definition.
(thesaurus)
'chalet i designed' is the wordplay.
'designed' indicates anagramming the letters (designed with the letters).
'chalet'+'i'='chaleti'
'chaleti' anagrammed gives 'ETHICAL'.
(Other definitions for ethical that I've seen before include "Approved moral behaviour" , "Morally right" , "Relating to morals" , "Conforming to accepted standards of behaviour" , "At Chile (anag.)" .)