Miss Holiday is no longer in fashion (5,3)

I believe the answer is:

leave out

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'miss' is the definition.
('leave out' can be a synonym of 'miss')

'holiday is no longer in fashion' is the wordplay.
'holiday' becomes 'leave' (I've seen this before).
'is no longer in fashion' becomes 'out' (I can't explain this - if you can you should give a lot more credence to this answer).
'leave'+'out'='LEAVE OUT'

Can you help me to learn more?

(Other definitions for leave out that I've seen before include "Drop" , "Fail to take" , "Omit, overlook" , "not put away" , "Omit, do not include" .)

I've seen this clue in the Irish Times.

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