How to make rats into the main act? (4-4)

I believe the answer is:

star-turn

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

'the main act?' is the definition.
(I've seen this before)

'how to make rats' is the wordplay.
'how' becomes 'turn' (I am not sure about this - if you are sure you should believe this answer much more).
'to' says to put letters next to each other (I've seen this in other clues).
'make' indicates anagramming the letters.
'rats' anagrammed gives 'star'.
'turn' after 'star' is 'STAR-TURN'.

'into' acts as a link.

Can you help me to learn more?

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

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