Slovenian cooker? (4)

I believe the answer is:

oven

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'cooker?' is the definition.
(synonyms)

'slovenian' is the wordplay.
'OVEN' is hidden within the letters.
However, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for oven that I've seen before include "It may get very hot" , "Kiln, perhaps" , "Kitchen appliance" , "Stove" , "You can cook in this" .)

I've seen this clue in the Evening Standard.

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