Singer, speaker and social media influencer? (7)

I believe the answer is:

tweeter

I'm a little stuck... Click here to teach me more about this clue!

'singer speaker' is the definition.
'tweeter' can be an answer for 'speaker' (tweeter is a kind of speaker). I am not certain of the 'singer' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for tweeter that I've seen before include "with high frequency?" , "little Speaker" , "Person sending a messages of fewer than 140 characters" , "Message sender" , "Chirpy type" .)

I've seen this clue in The Telegraph.

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