Adjust wood around front of window (5)
I believe the answer is:
tweak
'adjust' is the definition.
(I've seen this before)
'wood around front of window' is the wordplay.
'wood' becomes 'teak' (type of timber).
'around' means one lot of letters goes inside another.
'front of' indicates taking the first letters (the letter at the front of the word).
The initial letter of 'window' is 'w'.
'teak' placed around 'w' is 'TWEAK'.
(Other definitions for tweak that I've seen before include "Make minor adjustment" , "Make minor adjustments" , "Nip" , "Slightly alter" , "Twist; adjust finely" .)