Crossword Genius

Ingredient in a drink not stirred, I see (5)

Ross

I believe the answer is:

tonic

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'ingredient in a drink' is the definition.
'tonic' can be an answer for 'drink' (tonic is a kind of drink). I am not certain of the 'ingredient in a' bit.

'not stirred i see' is the wordplay.
'stirred' is an anagram indicator.
'see' becomes 'C' (the word for the letter, according to Chambers).
'not' with letters rearranged gives 'ton'.
'ton'+'i'+'c'='TONIC'

Can you help me to learn more?

(Other definitions for tonic that I've seen before include "do for musicians" , "It goes with gin" , "something nice and fresh" , "something medicinal" , "Stimulus" .)

I've seen this clue in the Evening Standard.
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