Left omens about fruit (6)
I believe the answer is:
lemons
'fruit' is the definition.
'left omens about' is the wordplay.
'left' becomes 'l' (common abbreviation).
'about' indicates an anagram.
'omens' with letters rearranged gives 'emons'.
'l'+'emons'='LEMONS'
(Other definitions for lemons that I've seen before include "Citrus friuts" , "Strangely melons could be citrus fruits" , "Could strange melons be citrus?" .)