Good person has a right to take the lead (4)
I believe the answer is:
star
'take the lead' is the definition.
(I've seen this in another clue)
'good person has a right' is the wordplay.
'good person' becomes 'st' (saint).
'has' says to put letters next to each other.
'a right' becomes 'ar' (I've seen this in other clues).
'st'+'ar'='STAR'
'to' acts as a link.
(Other definitions for star that I've seen before include "Possible Christmas tree topper?" , "Symbol of excellence" , "Big name" , "See 21" , "Heavenly apparition" .)