Crossword Genius

Part of day, we are shortening formal attire (11)

Ross

I believe the answer is:

eveningwear

'formal attire' is the definition.
(I know that eveningwear is a type of formal attire)

'part of day we are shortening' is the wordplay.
'part of day' becomes 'evening' (latter part of the day).
'shortening' means to remove the last letter.
'are' with its last letter taken away is 'ar'.
'evening'+'we'+'ar'='EVENINGWEAR'

I've seen this clue in The Times.
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