Annoying children with black rodents (5)
I believe the answer is:
brats
'annoying children' is the definition.
'brats' can be an answer for 'children' (brat is a kind of child). I am unsure of the 'annoying' bit.
'with black rodents' is the wordplay.
'with' is a charade indicator (letters next to each other).
'black' becomes 'b' (as in pencil classifications).
'rodents' becomes 'rats' (rat is a kind of rodent).
'b' next to 'rats' is 'BRATS'.
Can you help me to learn more?
(Another definition for brats that I've seen is " naughty kids".)