Bart tips off; "Small roles" (3,5)

I believe the answer is:

bit parts

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'small roles' is the definition.
'bit parts' can be an answer for 'roles' (bit part is a kind of role). I am not sure about the 'small' bit.

'bart tips off' is the wordplay.
'off' is an anagram indicator.
'bart'+'tips'='barttips'
'barttips' is an anagram of 'BIT PARTS'.

Can you help me to learn more?

(Other definitions for bit parts that I've seen before include "Small roles for actors" , "Small roles in plays or films" .)

I've seen this clue in the Sydney Morning Herald.

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