A particular herb, or, for instance, a number (7)

I believe the answer is:

oregano

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'a particular herb' is the definition.
'oregano' can be an answer for 'herb' (oregano is a kind of herb). I'm unsure of the 'a particular' bit.

'or for instance a number' is the wordplay.
'for instance' becomes 'eg' (short for 'exempli gratia', 'for example' in Latin).
'number' becomes 'no' (abbreviation for 'number').
'or'+'eg'+'a'+'no'='OREGANO'

Can you help me to learn more?

(Other definitions for oregano that I've seen before include "Wild marjoram" , "Kitchen herb" , "aromatic plant" , "Herb related to marjoram" , "Dried marjoram" .)

I've seen this clue in The Times.

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