Drink with an American at the Nag's Head (3)
I believe the answer is:
gin
'drink' is the definition.
(gin is an alcoholic drink)
'an american at the nag's head' is the wordplay.
'an american' becomes 'gi' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'at' says to put letters next to each other.
'head' says to take the initial letters.
The initial letter of 'nags' is 'n'.
'gi'+'n'='GIN'
'with' acts as a link.
Can you help me to learn more?
(Other definitions for gin that I've seen before include "Trap for snaring small mammals" , "Common spirit" , "It often gets mixed up with this" , "game of cards" , "Trap; mother's ruin" .)