Prompt the star (4)
I believe the answer is:
lead
This clue is a double definition.
'prompt' is the first definition.
(thesaurus)
'star' is the second definition.
(I know that star can be written as lead)
'the' is the link.
(Other definitions for lead that I've seen before include "1 down, symbol Pb" , "Accompany to show the way" , "Be in charge of, element" , "front man" , "Guide,direct" .)