Crossword Genius

Speaker is a bird (7)

Ross

I believe the answer is:

tweeter

I believe this is a double definition.

'speaker' is the first definition.
(tweeter is a kind of speaker)

'bird' is the second definition.

'is a' is the link.

(Other definitions for tweeter that I've seen before include "hi-fi unit?" , "piece of hi-fi" , "one delivering a short message?" , "One may follow another" , "Chirpy type" .)

I've seen this clue in The Mirror.
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