Severely cut? (5)
I believe the answer is:
sever
'cut?' is the definition.
(severing is a kind of cutting)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for sever that I've seen before include "Divide by cutting" , "Cut off suddenly" , "Cut from a whole" , "Detach" , "Divide, cut" .)