Can't seem to repair the window (8)
I believe the answer is:
casement
'the window' is the definition.
(casement is a kind of window)
'can't seem to repair' is the wordplay.
'to repair' is an anagram indicator.
'cant'+'seem'='cantseem'
'cantseem' anagrammed gives 'CASEMENT'.
(Other definitions for casement that I've seen before include "Type of window" , "Roger's window?" , "Window that opens with hinges on side, like a door" , "Irish nationalist" , "window frame" .)