Support one function circulating Polish dumpling (7)

I believe the answer is:

pierogi

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'support one function' is the definition.
I know nothing about this answer so I can't judge whether this works.

'circulating polish dumpling' is the wordplay.
'circulating' is an insertion indicator (to circulate is to go round).
'polish' becomes 'i' (I can't justify this - if you can you should give a lot more credence to this answer).
'dumpling' becomes 'perogi' (I've seen this before).
'i' going within 'perogi' is 'PIEROGI'.

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(Another definition for pierogi that I've seen is " dumplings".)

I've seen this clue in the Sydney Morning Herald.

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