Dope in two varieties of blue (7)
I believe the answer is:
lowdown
'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" .)