Waiter had slung out relatives (9-2-3)

I believe the answer is:

daughters-in-law

'relatives' is the definition.
(daughter-in-law is a kind of relative)

'waiter had slung out' is the subsidiary indication.
'out' is an anagram indicator.
'waiter'+'had'+'slung'='waiterhadslung'
'waiterhadslung' with letters rearranged gives 'daughtersinlaw'.

(Another definition for daughters-in-law that I've seen is " relatives".)

I've seen this clue in The Independent.

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