Seriously afflicted (8)
I believe the answer is:
stricken
'seriously afflicted' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for stricken that I've seen before include "Badly hurt" , "Laid low, out of action" , "Overcome by grief or shock" , "Severely afflicted" , "Deeply affected, by grief say" .)