Complaint raised - some witness it, I tape him (9)
I believe the answer is:
hepatitis
'complaint' is the definition.
(hepatitis is a kind of health problem)
'raised some witness it i tape him' is the wordplay.
'raised' shows that the letters should be reversed in order (going up in a down clue).
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'sititapeh' is hidden within 'witness it i tape him'.
'sititapeh' reversed gives 'HEPATITIS'.
(Other definitions for hepatitis that I've seen before include "Disease affecting liver" , "Inflammation of liver - I hate pits (anag)" , "Complaint" .)