Crossword Genius

Volume turned up after seabird bites head of injured auk (9)

Ross

I believe the answer is:

guillemot

'auk' is the definition.
(guillemot is a kind of auk)

I cannot understand how the remainder of the clue works.

(Other definitions for guillemot that I've seen before include "cliff-ledge nester" , "Seabird" , "An auk" , "Fisher" , "Diving bird" .)

I've seen this clue in The Guardian.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.