Duck turns up among the ingredients (5)
I believe the answer is:
eider
'duck' is the definition.
(eider is a kind of duck)
'turns up among the ingredients' is the wordplay.
'turns up' says the letters should be written backwards.
'among' indicates a hidden word.
'redie' can be found hidden inside 'ingredients'.
'redie' written backwards gives 'EIDER'.
(Other definitions for eider that I've seen before include "Source of fine soft down" , "Duck known for down" , "Sea-duck" , "Down comes from this" , "Duck from which down is obtained" .)