Rather blurred, which is puzzling (4,2,3)
I believe the answer is:
hard to see
'rather blurred which' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'puzzling' is the wordplay.
I cannot really see how this works, but
'puzzling' could be 'hard' (I've seen this in another clue) and 'hard' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
'is' is the link.
Can you help me to learn more?
I've seen this clue in the Evening Standard.
Want a hint initially instead of a full solution?
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