Comic book star up in her, rose alarmingly
I believe the answer is:
superhero
'comic book star' is the definition.
The definition suggests a singular noun which matches the answer.
'up in her rose alarmingly' is the wordplay.
'in' is an insertion indicator.
'alarmingly' indicates anagramming the letters (I've seen this in other clues).
'her'+'rose'='herrose'
'herrose' anagrammed gives 'serhero'.
'up' inserted within 'serhero' is 'SUPERHERO'.
Can you help me to learn more?
(Other definitions for superhero that I've seen before include "One possibly involved in saving" , "Her poseur (anag.)" , "Batman perhaps" , "I'm often seen in a cape" , "Fictional character with strange powers" .)