Kids who could play the part of Bart Simpson? (5)

I believe the answer is:

brats

I'm a little stuck... Click here to teach me more about this clue!

'kids who could play the part' is the definition.
'brats' can be an answer for 'kids' (brat is a kind of kid). I'm unsure of the rest of the definition.

'of bart simpson?' is the wordplay.
'of' is an anagram indicator (the answer comes from or 'of' the letters).
'simpson?' becomes 's' (this could be a standard abbreviation of which I'm unaware).
'bart' with letters rearranged gives 'brat'.
'brat'+'s'='BRATS'

Can you help me to learn more?

(Another definition for brats that I've seen is " naughty kids".)

I've seen this clue in the Evening Standard.

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