Furious attack around a bridgehead (5)
I believe the answer is:
Here is my best explanation:
'furious' is the definition.
'attack around a bridgehead' is the wordplay.
'attack' becomes 'raid' (raiding is a kind of attacking).
'around' indicates putting letters inside.
'a bridgehead' becomes 'b' (head letter of 'bridge').
'raid' placed around 'b' is 'RABID'.