Cameo suitable for child actor? (5,4)

I believe the answer is:

minor part

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'cameo suitable' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'child actor?' is the wordplay.
'child' becomes 'minor' (synonyms).
'actor?' becomes 'part' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'minor'+'part'='MINOR PART'

'for' is the link.

Can you help me to learn more?

I've seen this clue in The Independent.

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