Fixed a strip of wood or metal around front of window (7)
I believe the answer is:
screwed
'fixed' is the definition.
(screwing is a kind of fixing)
'a strip of wood or metal around front of window' is the wordplay.
'a strip of wood or metal' becomes 'screed' (building term).
'around' indicates putting letters inside.
'front of' indicates taking the first letters.
The initial letter of 'window' is 'w'.
'screed' placed around 'w' is 'SCREWED'.
(Other definitions for screwed that I've seen before include "Tightened - fastened (together)" , "secured into position" , "in serious trouble" , "Spoiled" , "tight?" .)