He's capable of a nice contribution to public relations (6)
I believe the answer is:
prince
'he's' is the definition.
'capable of a nice contribution to public relations' is the wordplay.
I cannot really see how this works, but
an anagram of 'nice' is 'ince' which is located in the answer.
'public relations' could be 'pr' (abbreviation) and 'pr' is found in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for prince that I've seen before include "See 1" , "Son of a royal house" , "Sovereign's son" , "Panto character" , "Canadian province" .)