Listen to me: wasps sting, taking a segment (4)

I believe the answer is:

psst

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

'listen to me' is the definition.
(I've seen this before)

'wasps sting taking a segment' is the wordplay.
'PSST' is hidden within the letters.
However, I am uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for psst that I've seen before include "Listen!" , "Quiet attention-seeker" , "Soft sound to get someone's attention" , "Sound of call to hear a secret" , "Surreptitious attention-seeker" .)

I've seen this clue in The Everyman puzzle in The Observer.

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