As used in Provencal cooking? (4)

I believe the answer is:

oven

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'as' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'in provencal cooking?' is the wordplay.
'in' indicates a hidden word.
'OVEN' is hidden in the letters of 'provencal cooking'.

'used' acts as a link.

Can you help me to learn more?

(Other definitions for oven that I've seen before include "Compartment for heating" , "Cooker; furnace" , "You can cook in this" , "Kitchen range, say" , "Part of a cooker" .)

I've seen this clue in the Evening Standard.

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