Crossword Genius

Short online message from bird (5)

Ross

I believe the answer is:

tweet

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'short online message' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for tweet that I've seen before include "Brief message" , "Twitter" , "Note of a small bird" , "Short message posted on the internet" , "Short online message" .)

I've seen this clue in The Mirror.
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