Characters in St Tropez - a majority retiring in shock (5)
I believe the answer is:
amaze
'shock' is the definition.
(I've seen this before)
'characters in st tropez a majority retiring' is the wordplay.
'characters in' indicates a hidden word.
'retiring' is a reversal indicator.
'ezama' is hidden within 'st tropez a majority'.
'ezama' back-to-front is 'AMAZE'.
'in' is the link.
(Other definitions for amaze that I've seen before include "baffle" , "Bewilder" , "shock" , "Flummox" , "Confound with wonder" .)