Celebrity in The Sun (4)
I believe the answer is:
star
I believe this is a double definition.
'celebrity' is the first definition.
(a star is a celebrity or famous person)
'the sun' is the second definition.
(I've seen this in another clue)
'in' is the link.
(Other definitions for star that I've seen before include "Hollywood figure" , "Screen idol" , "eg The sun" , "Famous entertainer" , "Lead actor" .)