Horrible din from low crows (4,6)

I believe the answer is:

blue murder

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'horrible din' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'low crows' is the wordplay.
'low' becomes 'blue' (both can mean unhappy).
'crows' becomes 'murder' (I've seen this before).
'blue'+'murder'='BLUE MURDER'

'from' is the link.

Can you help me to learn more?

(Other definitions for blue murder that I've seen before include "racket" , "Great outcry - horrible din" , "Terrible commotion?" .)

I've seen this clue in The Times.

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