Frisson (6)
(Other definitions for ripple that I've seen before include "Type of ice cream with coloured syrup" , "Slight surface wave" , "A small wave, or a gentle sound as of laughter" , "Small wave on the surface of a liquid" , "undulation" .)
'frisson' is the definition.
(I know that frisson can be written as shiver)
This is the entire clue.
(Other definitions for shiver that I've seen before include "Tremble slightly as from cold" , "Slightly shake" , "Momentary tremble" , "Shake with cold or fear" , "Tremble convulsively" .)