Clear case of grippe afflicted voter (3,4)
I believe the answer is:
get over
'clear' is the definition.
(I've seen this before)
'case of grippe afflicted voter' is the wordplay.
'case of' means to remove the middle letters (like emptying a case).
'afflicted' is an anagram indicator.
'grippe' with its middle removed is 'ge'.
'voter' is an anagram of 'tover'.
'ge'+'tover'='GET OVER'
(Other definitions for get over that I've seen before include "master?" , "Clear" , "Recover" , "Deal with successfully, improve in health" .)