Drink in Irish county town at first (6)
I believe the answer is:
claret
'drink' is the definition.
(claret is a kind of drink)
'irish county town at first' is the wordplay.
'irish county' becomes 'clare' (County Clare in Ireland).
'at first' says to take the initial letters.
The first letter of 'town' is 't'.
'clare'+'t'='CLARET'
'in' is the link.
(Other definitions for claret that I've seen before include "Deep purplish-red" , "Dark purplish-red colour" , "vessel might contain this?" , "Red wine from southern France" , "French wine" .)