Attacks team in Norfolk region (10)
I believe the answer is:
broadsides
'attacks' is the definition.
(broadside is a kind of attack)
'team in norfolk region' is the wordplay.
'team' becomes 'side' (both can mean a sports team).
'in' means one lot of letters goes inside another.
'norfolk region' becomes 'broads' (as in the Norfolk Broads).
'side' placed into 'broads' is 'BROADSIDES'.
(Other definitions for broadsides that I've seen before include "Strongly critical attacks" , "Verbal attacks" .)