King is in Paris: high point (5)
I believe the answer is:
crest
'high point' is the definition.
(I've seen this in another clue)
'king is in paris' is the wordplay.
'king' becomes 'CR' (short for Carolus Rex, King Charles in Latin).
'is in paris' becomes 'est' ('is' in French).
'cr'+'est'='CREST'
(Other definitions for crest that I've seen before include "Heraldic device representing a family" , "Summit ridge" , "Highest point" , "Top of a ridge/wave" , "Head" .)