A question of double identity? (5,2,5)
I believe the answer is:
which is which
'double identity?' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'a question' is the wordplay.
I cannot really understand how this works, but
'question' could be 'which' (which is a question word) and 'which' is found within the answer.
This explanation may well be incorrect...
'of' is the link.
Can you help me to learn more?
I've seen this clue in The Globe and Mail and The Telegraph.
Want a hint initially instead of a full solution?
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