The ..., the ..., the king of all birds'' (poem for St Stephen's Day) (4)

I believe the answer is:

wren

(Other definitions for wren that I've seen before include "Bird - former British servicewoman" , "17th Century architect" , "Former RN woman" , "Troglodytes troglodytes" , "Man of note" .)

I've seen this clue in The Irish Times.

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