Crossword Genius

After instrument goes from cold to hot, it buzzes (6)

Ross

I believe the answer is:

hornet

'it buzzes' is the definition.
(hornets make a buzzing sound)

'after instrument goes from cold to hot' is the wordplay.
I cannot really understand how this works, but
'instrument' could be 'horn' (horn is a kind of instrument) and 'horn' is located in the answer.
'from' could be 'e' (I've seen this in other clues) and 'e' is present in the answer.
A single letter 't' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

(Other definitions for hornet that I've seen before include "Large wasp with vicious sting" , "Troublesome nester" , "Run through" , "A large wasp with serious sting" , "A large wasp with severe sting (6)" .)

I've seen this clue in The Guardian.
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