At such a meal, pals possibly get high (4-2)

I believe the answer is:

slap-up

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'at such a meal' is the definition.
I can't judge whether this definition defines the answer.

'pals possibly get high' is the wordplay.
'possibly' indicates an anagram.
'get' says to put letters next to each other.
'high' becomes 'up' (associated in meaning).
'pals' with letters rearranged gives 'slap'.
'slap'+'up'='SLAP-UP'

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(Other definitions for slap-up that I've seen before include "Very good, meal say" , "Of meal, rich and plentiful" , "Lavish, meal say" , "Lavish (colloq.)" , "Luxurious (feast)" .)

I've seen this clue in the Evening Standard.

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