Superstar's husband, a man under dire threat (5-5)
I believe the answer is:
heart-throb
'superstar's' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's a link between them I don't understand?
'husband a man under dire threat' is the wordplay.
'husband' becomes 'h' (abbreviation).
'a man' becomes 'rob' ().
'under' is a charade indicator (letters next to each other) (below, in a down clue).
'dire' indicates anagramming the letters.
'threat' with letters rearranged gives 'eartth'.
'rob' put after 'eartth' is 'eartthrob'.
'h'+'eartthrob'='HEART-THROB'
Can you help me to learn more?
(Other definitions for heart-throb that I've seen before include "Excitingly good-looking man" , "Person inspiring romantic thoughts" , "Romantic and good-looking male celebrity" , "One inciting romantic feelings" , "Subject of infatuation" .)