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Double murder term for Bloody Norah! (5,3,5)

Ross

I believe the answer is:

stone the crows

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

'double murder term for bloody norah' is the definition.
I can't judge whether this defines the answer.

'for bloody norah' is the wordplay.
I cannot quite understand how this works, but
'for' could be 'to' (eg both can mean 'in the opinion of') and 'to' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for stone the crows that I've seen before include "Expression showing surprise" , "Chesterton sow (anag) - expression of amazement" , "My goodness!" , "Good grief!" .)

I've seen this clue in The Telegraph.
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