500 frivolous pieces for food processors (8)

I believe the answer is:

dairymen

'food processors' is the definition.
(people who process dairy products)

'500 frivolous pieces' is the wordplay.
'500' becomes 'd' (Roman numeral for 500).
'frivolous' becomes 'airy'.
'pieces' becomes 'men' ('man' can be a synonym of 'piece').
'd'+'airy'+'men'='DAIRYMEN'

'for' is the link.

(Another definition for dairymen that I've seen is " those who deal in the white stuff".)

I've seen this clue in The Guardian.

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