Crossword Genius

Having called, we’re told, had managed to extract from (5)

Ross

I believe the answer is:

wrung

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'we're told had managed to extract from' is the definition.
I can't judge whether this defines the answer.

'having called' is the wordplay.
'having' becomes 'w' (I can't justify this - if you can you should give a lot more credence to this answer).
'called' becomes 'rung' (ring can mean to call on the phone).
'w'+'rung'='WRUNG'

Can you help me to learn more?

(Other definitions for wrung that I've seen before include "Squeezed and twisted" , "Twisted and compressed" , "Coerced" .)

I've seen this clue in the Evening Standard.
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