Do such girls rabbit on a lot? (5)
I believe the answer is:
bunny
'do such girls' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'rabbit on a lot?' is the wordplay.
'rabbit' becomes 'bun'.
'on' means one lot of letters go next to another.
'a lot?' becomes 'ny' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'bun'+'ny'='BUNNY'
Can you help me to learn more?
(Other definitions for bunny that I've seen before include "Child's term for a burrower" , "Child's word for rabbit" , "Young rabbit" , "pet!" , "Bugs this" .)