Blood surrounds gangster in abundance (6)
I believe the answer is:
galore
'in abundance' is the definition.
(thesaurus)
'blood surrounds gangster' is the wordplay.
'blood' becomes 'gore' ('gore' can be a synonym of 'blood').
'surrounds' indicates putting letters inside.
'gangster' becomes 'al' (Al Capone).
'gore' going around 'al' is 'GALORE'.
(Other definitions for galore that I've seen before include "abundantly" , "Pussy ---, Bond girl" , "Aplenty" , "Lo, Reg, a change could be in abundance" , "Existing in great numbers" .)