Ridicule new seat, to a point (5)
I believe the answer is:
tease
'ridicule' is the definition.
(I know that ridicule is a is a more specific form of the action of tease)
'new seat to a point' is the wordplay.
'new' is an anagram indicator.
'to a point' becomes 'e' (compass point).
'seat' is an anagram of 'teas'.
'teas'+'e'='TEASE'
(Other definitions for tease that I've seen before include "Page of book" , "Vex" , "Kid" , "Use a comb" , "Deride" .)