Crossword Genius

Holidays cancelled? You're joking (5,3)

Ross

I believe the answer is:

leave off

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'you're joking' is the definition.
I can't judge whether this defines the answer.

'holidays cancelled?' is the wordplay.
'holidays' becomes 'leave'.
'cancelled?' becomes 'off' ('off' can be similar in meaning to 'cancelled').
'leave'+'off'='LEAVE OFF'

Can you help me to learn more?

(Other definitions for leave off that I've seen before include "not eating or drinking" , "Cease, or shed garment" , "Give over!" .)

I've seen this clue in The Guardian.
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