Disguised gin/tonic mix with nothing to follow (9)
I believe the answer is:
incognito
'disguised' is the definition.
(I've seen this before)
'gintonic mix with nothing to follow' is the wordplay.
I cannot really see how this works, but
an anagram of 'gintonic' is 'incognit' which is located in the answer.
'nothing' could be 'o' (O resembles 0) and 'o' is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for incognito that I've seen before include "Using false name" , "With identity hidden" , "On the sly" , "hiding identity" , "With one's identity concealed" .)