Duck about to eat wrong plant (5)
I believe the answer is:
lupin
'wrong plant' is the definition.
'lupin' can be an answer for 'plant' (I've seen this before). I'm not sure about the 'wrong' bit.
'duck about to eat' is the wordplay.
'duck' becomes 'nil' (both can mean zero).
'about' shows that the letters should be reversed in order.
'to' becomes 'up' (I can't justify this - if you can you should believe this answer much more).
'eat' indicates putting letters inside.
'nil' backwards is 'lin'.
'lin' placed around 'up' is 'LUPIN'.
Can you help me to learn more?
(Other definitions for lupin that I've seen before include "Flowering plant" , "Garden plant with long, spiky flowers" , "It has tall flower spike" , "Garden plant of the pea family" , "9 [BLOOM]" .)