Drop a question that, in part, is not clear (6)

I believe the answer is:

opaque

'is not clear' is the definition.
('opaque' is the opposite to 'clear')

'drop a question that in part' is the wordplay.
'that in part' indicates a hidden word.
'OPAQUE' is hidden in the letters of 'drop a question'.

(Other definitions for opaque that I've seen before include "Not translucent" , "Cloudy, not transparent" , "Murky" , "Hard to understand, see through" , "Unintelligible" .)

I've seen this clue in The Guardian.

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