One in Sweden's ready for a drink (3)
I believe the answer is:
kir
'a drink' is the definition.
(I've seen this before)
'one in sweden's ready' is the wordplay.
'one' becomes 'i' (Roman numeral).
'in' is an insertion indicator.
'sweden's ready' becomes 'kr' (kronor, Swedish currency**).
'i' placed within 'kr' is 'KIR'.
'for' is the link.
(Other definitions for kir that I've seen before include "One that's drunk" , "Mixture of white wine and cassis" , "Cocktail" , "Blackcurrant drink" , "Cassis-flavoured wine" .)