Tabloid is upset initially on identifying daring starlet’s curves (9)

I believe the answer is:

sinusoids

'curves' is the definition.
(sinusoid is a kind of curve)

'tabloid is upset initially on identifying daring starlet's' is the wordplay.
'tabloid' becomes 'sun' (The Sun, UK newspaper).
'upset' shows that the letters should be reversed in order.
'initially' indicates taking the first letters.
The initial letters of 'on identifying daring starlets' is 'oids'.
'sun'+'is'='sunis'
'sunis' backwards is 'sinus'.
'sinus'+'oids'='SINUSOIDS'

I've seen this clue in The Independent.

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