To wits, perhaps, slangy advice to pack up (4,2)

I believe the answer is:

stow it

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'slangy advice to pack up' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'to wits perhaps' is the wordplay.
'perhaps' indicates an anagram.
'to'+'wits'='towits'
'towits' with letters rearranged gives 'STOW IT'.

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I've seen this clue in the Evening Standard.

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