Young actress playing with rattles (7)

I believe the answer is:

starlet

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'young actress' is the definition.
(synonyms)

'playing with rattles' is the wordplay.
'rattles' anagrams to 'STARLET'.
However, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for starlet that I've seen before include "Promising young film actress" , "young celebrity" , "Young film actress with a future?" .)

I've seen this clue in the Evening Standard.

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