Join me for a set piece (4)

I believe the answer is:

meet

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'join' is the definition.
(meeting is a kind of joining)

'me for a set piece' is the wordplay.
'for' says to put letters next to each other.
'a set piece' becomes 'et' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'me'+'et'='MEET'

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(Other definitions for meet that I've seen before include "Appropriate" , "Attend" , "Touch; suitable (arch.)" , "Confront" , "Hunting gathering" .)

I've seen this clue in the Evening Standard.

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