Drink with a teetotaller out of love (3)
I believe the answer is:
tot
'drink' is the definition.
(a small alcoholic drink)
'teetotaller out of love' is the wordplay.
'teetotaller' becomes 'tt' (abbreviation).
'out of' means one lot of letters goes inside another (some letters on the outside of others).
'love' becomes 'o' (love means zero in tennis).
'tt' enclosing 'o' is 'TOT'.
'with a' is the link.
(Other definitions for tot that I've seen before include "Calculate" , "Small drink; accumulate" , "Small drink - young child" , "Get the sum for the toddler" , "Small amount of spirits" .)