Crossword Genius

Mad military operation to capture bridgehead (5)

Ross

I believe the answer is:

rabid

'mad' is the definition.
(I've seen this before)

'military operation to capture bridgehead' is the wordplay.
'military operation' becomes 'raid' (I've seen this before).
'to capture' indicates putting letters inside.
'bridgehead' becomes 'b' (head letter of 'bridge').
'raid' going around 'b' is 'RABID'.

(Other definitions for rabid that I've seen before include "Extremely fanatical" , "Extreme, fanatical" , "Fanatical like mad dog" , "Fanatical, infected" , "Wild" .)

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