Readiness to eat shown by one in safety (10)
I believe the answer is:
salivation
'readiness to eat shown' is the definition.
I can't judge whether this definition defines the answer.
'one in safety' is the wordplay.
'one' becomes 'i' (Roman numeral).
'in' is an insertion indicator.
'safety' becomes 'salvation'.
'i' going inside 'salvation' is 'SALIVATION'.
'by' is the link.
Can you help me to learn more?
(Other definitions for salivation that I've seen before include "Signs of expecting lunch" , "preparation for eating" , "sign of hunger" , "Sign of anticipation" .)