Crossword Genius

Gregarious crow (4)

Ross

I believe the answer is:

rook

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">gregarious crow</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for rook that I've seen before include "Chesspiece otherwise known as a castle" , "Species of crow" , "Swindle (colloq.); bird" , "Gregarious black bird" , "Chess piece also called castle" .)

I've seen this clue in The Independent.
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