So sharp it could rip your ear off. (6)
I believe the answer is:
rapier
'so sharp' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'it could rip your ear off' is the wordplay.
I cannot really understand how this works, but
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is found within the answer.
an anagram of 'rip' is 'pir' which is located in the left over letters.
The remaining letters 'ra' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for rapier that I've seen before include "Thin sharp sword" , "Thrusting weapon" , "Straight sword with narrow blade" , "Fine-bladed sword" , "Narrow sword with two-edged blade" .)