It may be in the bag (3)
I believe the answer is:
kit
This could be a double definition.
'it may be' is the first definition.
The definition suggests a singular noun which matches the answer.
'the bag' is the second definition.
The answer and definition can be both animals as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'in' is the link.
Can you help me to learn more?
(Other definitions for kit that I've seen before include "Set of tools or clothes" , "Stuff" , "tackle" , "Young beaver" , "Set of equipment, perhaps for first-aid" .)