Some people want this from a star sign (9)
I believe the answer is:
autograph
'sign' is the definition.
(I know that autograph is a more specific form of the action sign)
'some people want this from a star' is the wordplay.
I cannot really understand how this works, but
'some' could be 'a' and 'a' is found within the answer.
'from' could be 'o' (I've seen this in other clues) and 'o' is present in the answer.
'a' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for autograph that I've seen before include "One's signature" , "a collector's item perhaps" , "A signature given as souvenir" , "One's signed" , "Famous person's signature" .)