Unsettlingly startle a young actress (7)
I believe the answer is:
starlet
'a young actress' is the definition.
('starlet' can be a synonym of 'young actress')
'unsettlingly startle' is the wordplay.
'startle' can be anagrammed to 'STARLET'.
But, I am not sure how this is indicated.
Can you help me to learn more?
(Other definitions for starlet that I've seen before include "young celebrity" , "Young film actress with a future?" , "Promising young film actress" .)