What might reveal sight, including tree, extremely typical (11)

I believe the answer is:

streetlight

'what might reveal' is the definition.
(a streetlight might reveal something)

'sight including tree extremely typical' is the wordplay.
'including' is an insertion indicator.
'extremely' suggests removing the centre (only the extremes of the word are used).
'typical' with its centre taken out is 'tl'.
'tree'+'tl'='treetl'
'sight' placed around 'treetl' is 'STREETLIGHT'.

I've seen this clue in The Times.

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