Personage for whom public relations can be nice (6)
I believe the answer is:
prince
'personage' is the definition.
(I have seen 'Royal personage' mean 'prince' so perhaps 'personage' could also mean 'prince')
'public relations can be nice' is the wordplay.
'public relations' becomes 'PR' (abbreviation).
'can be' indicates an anagram.
'nice' anagrammed gives 'ince'.
'pr'+'ince'='PRINCE'
'for whom' is the link.
(Other definitions for prince that I've seen before include "Son of a royal house" , "Royal personage" , "Machiavellian ruler" , "See 1" , "King's son" .)