Some Scandinavians, we hear, become void (5)
I believe the answer is:
lapse
'become void' is the definition.
(I've seen this before)
'some scandinavians we hear' is the wordplay.
'some scandinavians' becomes 'lapps' (I've seen this in another clue).
'we hear' shows a homophone (sound like).
'lapps' is a homophone of 'LAPSE'.
(Other definitions for lapse that I've seen before include "Failing" , "Decline into an inferior state" , "Temporary drop in standard" , "Run out" , "Brief failure (of concentration)" .)