One in Sweden's ready for a drink (3)
I believe the answer is:
Here is my best explanation:
'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", "Blackcurrant drink", "Cocktail", "Wine with blackcurrant", "Cassis-flavoured wine", "Mixture of white wine and cassis", "White wine with blackcurrant syrup", "White wine and cassis", "Wine and cassis drink" and "Drink of white wine and cassis".)