Ask hoarsely for tool (4)
I believe the answer is:
rasp
'for tool' is the definition.
(rasp is a kind of tool)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for rasp that I've seen before include "Grating noise; file" , "Grate; scrape" , "Coarse file or grating sound" , "It is used to grate" , "Harsh grating sound" .)