Crossword Genius

Pastry costs for types of salt (9)

Ross

I believe the answer is:

tartrates

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'types of salt' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'pastry costs' is the wordplay.
'pastry' becomes 'tart' (type of pastry).
'costs' becomes 'rates' (rate is a kind of cost).
'tart'+'rates'='TARTRATES'

'for' is the link.

Can you help me to learn more?

(Another definition for tartrates that I've seen is " acidic salts".)

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