A cat slid around in cream of tartar, perhaps (4,4)

I believe the answer is:

acid salt

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'cream of tartar perhaps' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'a cat slid around' is the wordplay.
'around' indicates an anagram.
'cat'+'slid'='catslid'
'catslid' with letters rearranged gives 'cidsalt'.
'a'+'cidsalt'='ACID SALT'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for acid salt that I've seen before include "Compound such as potassium hydrogen sulphate" , "Compound; aids talc (anag.)" .)

I've seen this clue in The Independent.

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