Seasoning duck with orange, perhaps (7)
I believe the answer is:
oregano
'seasoning' is the definition.
(oregano is a kind of seasoning)
'duck with orange perhaps' is the wordplay.
'duck' becomes 'o'.
'with' is a charade indicator (letters next to each other).
'perhaps' indicates anagramming the letters.
'orange' with letters rearranged gives 'regano'.
'o'+'regano'='OREGANO'
(Other definitions for oregano that I've seen before include "herbal preparation" , "aromatic plant" , "Pungent seasoning leaves" , "food flavouring" , "Gear Ono up for the herb" .)