Baked small crumbles for function (6,4)

I believe the answer is:

masked ball

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'function' is the definition.
The answer and definition can be both groups as well as being singular nouns.
Maybe there's a link between them I don't understand?

'baked small crumbles' is the wordplay.
'crumbles' indicates an anagram.
'baked'+'small'='bakedsmall'
'bakedsmall' is an anagram of 'MASKED BALL'.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for masked ball that I've seen before include "special sort of party" , "social event" .)

I've seen this clue in The Times.

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