Untidy group of youngsters (6)
I believe the answer is:
litter
This could be a double definition.
'untidy group' is the first definition.
The answer and definition can be both groups as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'of youngsters' is the second definition.
The definition suggests a singular noun which matches the answer.
Can you help me to learn more?
(Other definitions for litter that I've seen before include "Chair or bed carrried on two poles" , "Cubs" , "Number of young animals born at one time" , "Odds and ends of rubbish left lying about" , "Brood of young born to an animal" .)