Crossword Genius

Extinct bird mentioned in dreary lecture (5,3)

Ross

I believe the answer is:

great auk

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'extinct bird' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

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(Other definitions for great auk that I've seen before include "Bird no longer around" , "Extinct sea bird" , "Extinct flightless bird" , "Extinct seabird" .)

I've seen this clue in The Guardian.
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