Unusual ad remains for pre-cook sauces (9)

I believe the answer is:

marinades

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

'sauces' is the definition.
(I've seen this before)

'unusual ad remains' is the wordplay.
'unusual' is an anagram indicator.
'ad'+'remains'='adremains'
'adremains' anagrammed gives 'MARINADES'.

'for pre-cook' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for marinades that I've seen before include "steeps" , "Spicy mixtures" , "sauces" , "Pickles" .)

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

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