Close sibling displayed incidental wit (9,4)

I believe the answer is:

identical twin

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'close sibling' is the definition.
'identical twin' can be an answer for 'sibling' (identical twin is a kind of sibling). I am not sure about the 'close' bit.

'displayed incidental wit' is the wordplay.
'displayed' is an anagram indicator (letters displayed in another way).
'incidental'+'wit'='incidentalwit'
'incidentalwit' anagrammed gives 'IDENTICAL TWIN'.

Can you help me to learn more?

(Other definitions for identical twin that I've seen before include "Lookalike sibling" , "One of two from the same fertilised egg" .)

I've seen this clue in The Daily Express.

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