Part of Scandinavia grateful for potent drug (6)
I believe the answer is:
viagra
'potent drug' is the definition.
(viagra is a kind of potent drug)
'part of scandinavia grateful for' is the wordplay.
'part of' indicates the answer is hidden within the clue.
'VIAGRA' can be found hidden inside 'scandinavia grateful for'.
(Other definitions for viagra that I've seen before include "Drug aiding one's sex life" , "Drug treating impotence" , "Sildenafil citrate" , "Drug to improve potency" , "Promoter of the other" .)