"Drink? Not I," you say (3)

I believe the answer is:
tea
'drink?' is the definition.
(tea is a drink)
'i you say' is the wordplay.
I cannot really understand how this works, but
'i' could be 'a' and 'a' is present in the answer.
The remaining letters 'te' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'not' acts as a link.
Can you help me to learn more?
(Other definitions for tea that I've seen before include "Earl Grey?" , "Char" , "Darjeeling, e.g." , "Beverage; meal" , "Infused beverage" .)
