Are mixed with tonic for a concoction of one's own (8)
I believe the answer is:
creation
'a concoction of one's own' is the definition.
I can't judge whether this defines the answer.
'are mixed with tonic' is the wordplay.
'mixed with' indicates anagramming the letters.
'are' mixed up with 'tonic' can make 'CREATION'.
'for' is the link.
Can you help me to learn more?
(Other definitions for creation that I've seen before include "A thing made or invented" , "work" , "New product" , "Establishment" , "Life, the universe and everything" .)