Crossword Genius

2, ignorant crows? (6,2,3,4)

Ross

I believe the answer is:

murder in the dark

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'2' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'ignorant crows?' is the wordplay.
I cannot really understand how this works, but
'ignorant' could be 'inthedark' (in the dark means being ignorant about something) and 'inthedark' is present in the answer.
'crows?' could be 'murder' (I've seen this before) and 'murder' is present in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Guardian.
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