Window of oiler shattered (5)
I believe the answer is:
oriel
'window' is the definition.
(oriel is a kind of window)
'oiler shattered' is the wordplay.
'shattered' indicates an anagram.
'oiler' anagrammed gives 'ORIEL'.
'of' acts as a link.
(Other definitions for oriel that I've seen before include "Type of bay window" , "English college" , "Large snake" , "Overhanging recess (window)" , "Projecting window in upper storey" .)