Called deranged, indeed! (4)

I believe the answer is:

rang

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

'called' is the definition.
(called on the phone)

'deranged indeed' is the wordplay.
'RANG' is hidden within the letters.
But, I am uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for rang that I've seen before include "Called" , "Made tolling sound or phoned" , "(Of bell) sounded" , "Chimed" , "Telephoned" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app