Crossword Genius

A string’s bent by the ninth one? (4,4)

Ross

I believe the answer is:

star sign

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

'the ninth one?' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'a string's bent' is the wordplay.
'bent' is an anagram indicator.
'a'+'strings'='astrings'
'astrings' with letters rearranged gives 'STAR SIGN'.

'by' is the link.

Can you help me to learn more?

(Other definitions for star sign that I've seen before include "Eg, Taurus" , "rude demand for famous autograph?" , "Leo or Aquarius, say" , "Leo perhaps" , "One area into which the zodiac is divided" .)

I've seen this clue in The Guardian.
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