Newly cause to get an additive (5)
I believe the answer is:
sauce
'an additive' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'newly cause' is the wordplay.
'newly' indicates an anagram.
'cause' is an anagram of 'SAUCE'.
'to get' acts as a link.
Can you help me to learn more?
(Other definitions for sauce that I've seen before include "Cause for relish" , "one might get from a waiter" , "Accompaniment to meat ect" , "Moistener for food" , "Informal impudence or food flavouring" .)