Crossword Genius

Short tweet about a speaker? (5)

Ross

I believe the answer is:

chair

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This clue might be a double definition.

'short tweet' is the first definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'a speaker?' is the second definition.
(thesaurus)

'about' acts as a link.

Can you help me to learn more?

(Other definitions for chair that I've seen before include "Preside over - seat" , "Top seat of committee" , "What professor has" , "Presiding officer" , "Prof's post; meeting leader" .)

I've seen this clue in The Times.
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