Cower, flinch (6)
I believe the answer is:
cringe
This clue is a double definition.
'cower' is the first definition.
(I know that cower can be written as cringe)
'flinch' is the second definition.
(I know that flinch can be written as cringe)
(Other definitions for cringe that I've seen before include "quail" , "obeisance" , "Crouch" , "Shrink in fear, embarrassment, or servility" , "Start" .)