From bishop, a question's unclear (6)

I believe the answer is:

opaque

'unclear' is the definition.
('opaque' is associated in meaning with 'unclear')

'from bishop a question's' is the wordplay.
'from' indicates the answer is hidden within the clue.
'OPAQUE' can be found hidden inside 'bishop a questions'.

(Other definitions for opaque that I've seen before include "Hard to understand, see through" , "Incomprehensible, impenetrable" , "Hazy, unclear" , "Cloudy, not transparent" , "Shady" .)

I've seen this clue in The Telegraph.

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