Pot half caught in widespread outbreak (8)
I believe the answer is:
pandemic
'widespread outbreak' is the definition.
(I've seen this in another clue)
'pot half caught' is the wordplay.
'pot' becomes 'pan' (I've seen this in other clues).
'half' becomes 'demi' (prefix as in 'demigod').
'caught' becomes 'c' (cricket abbreviation).
'pan'+'demi'+'c'='PANDEMIC'
'in' acts as a link.
(Other definitions for pandemic that I've seen before include "Damn epic about world-wide disease" , "Denim cap (anag.)" , "Widespread health problem" , "Very widespread outbreak of a disease" , "Widely spread disease" .)