Improved profits lay in a pie ingredient (4,6)

I believe the answer is:

filo pastry

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

'a pie ingredient' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'improved profits lay' is the wordplay.
'improved' indicates an anagram.
'profits'+'lay'='profitslay'
'profitslay' with letters rearranged gives 'FILO PASTRY'.

'in' is the link.

Can you help me to learn more?

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

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.