Decent chalet I built (7)
I believe the answer is:
ethical
'decent' is the definition.
(thesaurus)
'chalet i built' is the wordplay.
'built' indicates anagramming the letters (the same letters can be used to build the answer).
'chalet'+'i'='chaleti'
'chaleti' with letters rearranged gives 'ETHICAL'.
(Other definitions for ethical that I've seen before include "Morally proper" , "Moral, honest" , "Principled (behaviour)" , "Morally good or correct" , "At Chile (anag.)" .)