Overwhelmed bishop in grip of total raging greed (9)
I believe the answer is:
submerged
'overwhelmed' is the definition.
('submerge' can be a synonym of 'overwhelm')
'bishop in grip of total raging greed' is the wordplay.
'bishop' becomes 'b' (abbreviation used in chess).
'in grip of' indicates putting letters inside.
'total' becomes 'sum' ('sum' can be a synonym of 'total').
'raging' is an anagram indicator.
'greed' anagrammed gives 'erged'.
'sum'+'erged'='sumerged'
'b' inserted into 'sumerged' is 'SUBMERGED'.
(Other definitions for submerged that I've seen before include "overwhelmed" , "Under water" , "Completely covered by liquid" .)