Cut at the right angle in a frame? (5)
I believe the answer is:
slash
'cut' is the definition.
(I know that slash is a type of cut)
'the right angle in a frame?' is the wordplay.
'the right angle' becomes 'L' (the shape of the letter is a right angle).
'in' indicates putting letters inside.
'a frame?' becomes 'sash' (sash is a kind of frame).
'l' going inside 'sash' is 'SLASH'.
'at' acts as a link.
(Other definitions for slash that I've seen before include "Drastically prune" , "Legendary guitarist" , "Cut as with a sword - /" , "rent" , "Violently cut" .)