Canary call (5)

I believe the answer is:

'canary call' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for tweet that I've seen before include "Short message posted on the internet" , "Brief message" , "Online communication" , "Short message on a social medium" , "throwaway message?" .)

I've seen this clue in the King Feature Syndicate and The Wall Street Journal.

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