Bolt cut by tool (7)
I believe the answer is:
scraper
'bolt cut by tool' is the definition.
'scraper' can be an answer for 'tool' (scraper is a kind of tool). I'm not sure about the 'bolt cut by' bit.
'bolt cut by tool' is the wordplay.
'bolt' becomes 'scram' (I've seen this in another clue).
'cut' means to remove the last letter.
'by tool' becomes 'per' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'scram' with its final letter removed is 'scra'.
'scra'+'per'='SCRAPER'
Can you help me to learn more?
(Other definitions for scraper that I've seen before include "Tool for, eg, removing wallpaper" , "Cleaning tool" , "Tool for removing, eg, dirt or paint" , "Object at the door" , "Wallpaper remover" .)