Grand star risks changing into costume for South Pacific (5,5)

I believe the answer is:

grass skirt

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

'costume for south pacific' is the definition.
I can't judge whether this defines the answer.

'grand star risks changing' is the wordplay.
'grand' becomes 'g' (synonyms).
'changing' indicates an anagram.
'star'+'risks'='starrisks'
'starrisks' is an anagram of 'rassskirt'.
'g'+'rassskirt'='GRASS SKIRT'

'into' acts as a link.

Can you help me to learn more?

I've seen this clue in The Guardian.

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