A prod behind a big bird (5)
I believe the answer is:
goose
'a prod' is the definition.
(I know that goose is a kind of prod)
'behind a big bird' is the wordplay.
I cannot quite understand how this works, but
'big' could be 'os' (abbreviation for oversize) and 'os' is located in the answer.
The remaining letters 'goe' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for goose that I've seen before include "Gander" , "Silly person" , "Seasonal fare" , "Marches in an odd fashion" , "Large waterbird" .)