Crossword Genius

Dope in two varieties of blue (7)

Ross

I believe the answer is:

lowdown

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'dope' is the definition.
(I've seen this before)

'two varieties of blue' is the wordplay.
'two varieties of' becomes 'low' (I can't explain this - if you can you should give a lot more credence to this answer).
'blue' becomes 'down' (both can mean sad).
'low'+'down'='LOWDOWN'

'in' is the link.

Can you help me to learn more?

(Other definitions for lowdown that I've seen before include "Dope" , "news" , "facts" , "Data" , "Inside information - mean" .)

I've seen this clue in The Independent.
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