Modern surgery tool left ears damaged (5)
I believe the answer is:
laser
'modern surgery' is the definition.
'laser' can be an answer for 'surgery' (thesaurus). I am not certain of the 'modern' bit.
'tool left ears damaged' is the wordplay.
I cannot quite understand how this works, but
'left' could be 'l' (common abbreviation) and 'l' is present in the answer.
an anagram of 'ears' is 'aser' which is located in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for laser that I've seen before include "Device producing an intense light beam - kind of sailing dinghy" , "Surgical device" , "Coherent light source" , "Device producing thin beam of light" , "Light-gun" .)