Pork ones can be unbelievable! (4)

I believe the answer is:

pies

I'm a little stuck... Click here to teach me more about this clue!

'pork ones' is the definition.
The definition and answer can be both quantities as well as being plural nouns.
Maybe you can see an association between them that I can't see?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for pies that I've seen before include "Dishes baked in pastry-lining" , "Pastry-topped puddings" , "See 1 Across" , "food" , "Pastry crusts with fillings" .)

I've seen this clue in the Evening Standard.

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