Pairs cavort for Trojan prince (5)
I believe the answer is:
paris
'trojan prince' is the definition.
(I've seen this before)
'pairs cavort' is the wordplay.
'cavort' indicates an anagram.
'pairs' with letters rearranged gives 'PARIS'.
'for' acts as a link.
(Other definitions for paris that I've seen before include "Eiffel Tower city" , "Capital of France" , "Arc de Triomphe city" , "where he got plastered?" , "where plaster comes from?" .)