Herb used in stew or, eg, an omelette (7)

I believe the answer is:

oregano

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'herb' is the definition.
(oregano is a kind of herb)

'in stew or eg an omelette' is the wordplay.
'in' means one lot of letters goes inside another.
'stew' indicates anagramming the letters.
'omelette' becomes 'o' (this could be a standard abbreviation which I don't know about).
'or'+'eg'+'an'='oregan'
'oregan' anagrammed gives 'regano'.
'regano' going around 'o' is 'OREGANO'.

'used' acts as a link.

Can you help me to learn more?

(Other definitions for oregano that I've seen before include "Dried marjoram" , "aromatic plant" , "food flavouring" , "Type of herb" , "Gear Ono up for the herb" .)

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

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