They’re sharp, and have left omens out (6)

I believe the answer is:

lemons

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'they're sharp and' is the definition.
The definition suggests an adverb but the answer is not.

'left omens out' is the wordplay.
'left' becomes 'l' (common abbreviation).
'out' indicates an anagram (out can mean wrong or inaccurate).
'omens' anagrammed gives 'emons'.
'l'+'emons'='LEMONS'

'have' is the link.

Can you help me to learn more?

(Other definitions for lemons that I've seen before include "Could strange melons be citrus?" , "Strangely melons could be citrus fruits" , "Citrus friuts" .)

I've seen this clue in The Mirror.

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