Bad case of wind gripping one (8)
I believe the answer is:
mistrial
'wind gripping one' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'bad case' is the wordplay.
'bad' becomes 'mis' (I can't explain this - if you can you should believe this answer much more).
'case' becomes 'trial' (I've seen this before).
'mis'+'trial'='MISTRIAL'
'of' is the link.
Can you help me to learn more?
(Other definitions for mistrial that I've seen before include "Defective hearing" , "Failed court action" , "When it's declared, the case must be heard again" , "Invalid hearing" , "Invalid court procedure" .)