Remove from Riviera sequence (5)
I believe the answer is:
erase
'remove' is the definition.
(I've seen this before)
'from riviera sequence' is the wordplay.
'from' indicates the answer is hidden within the clue.
'ERASE' is hidden in the letters of 'riviera sequence'.
(Other definitions for erase that I've seen before include "Remove evidence of" , "Blot out" , "Rub out, expunge" , "Take out" , "Delete" .)