Drink nothing when there's a teetotaller around! (3)

I believe the answer is:

tot

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'drink nothing' is the definition.
'tot' can be an answer for 'drink' (a small alcoholic drink). I'm not sure about the 'nothing' bit.

'a teetotaller around' is the wordplay.
'around' indicates the answer is hidden within the clue.
'TOT' can be found hidden inside 'teetotaller'.

'when there's' is the link.

Can you help me to learn more?

(Other definitions for tot that I've seen before include "Add; small child" , "Aggregate for infant" , "Youngster; short drink" , "Get the sum for the toddler" , "Add - youngster - dram" .)

I've seen this clue in the Evening Standard.

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