Birds my sage stuffing is not used in (5)
I believe the answer is:
geese
'birds' is the definition.
(goose is a kind of bird)
'my sage stuffing is not used in' is the wordplay.
I cannot really understand how this works, but
'my' could be 'gee' (I've seen this before) and 'gee' is found in the answer.
The remaining letters 'se' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for geese that I've seen before include "Simpletons" , "Web-footed migratory aquatic birds" , "Birds; silly people" , "They can be Barnacle, Brent or Canadian" , "Birds in a gaggle" .)