Gangster covered in blood everywhere (6)
I believe the answer is:
galore
'everywhere' is the definition.
(thesaurus)
'gangster covered in blood' is the wordplay.
'gangster' becomes 'al' (Al Capone).
'covered in' means one lot of letters goes inside another.
'blood' becomes 'gore' ('gore' can be a synonym of 'blood').
'al' inserted within 'gore' is 'GALORE'.
(Other definitions for galore that I've seen before include "to spare" , "In profusion" , "Pussy ---, Bond girl" , "Lo, Reg, a change could be in abundance" , "abundantly" .)