Calls received by Telegraph, one sarcastic (6)

I believe the answer is:

phones

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

'calls' is the definition.
('phone' can be a synonym of 'call')

'received by telegraph one sarcastic' is the wordplay.
'PHONES' is hidden within the letters.
But, I'm uncertain how the hidden word is indicated.

Can you help me to learn more?

(Another definition for phones that I've seen is " 'Calls, rings (6)'".)

I've seen this clue in The Telegraph.

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