Sauce never shaken (5)
I believe the answer is:
nerve
'sauce' is the definition.
(I've seen this before)
'never shaken' is the wordplay.
'shaken' is an anagram indicator.
'never' anagrammed gives 'NERVE'.
(Other definitions for nerve that I've seen before include "Fibre that transmits instructions to the brain" , "Cord that carries instructions from brain to body" , "Bottle, courage" , "Courage to carry on" , "Temerity" .)