Unanimously (9)
'unanimously' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for to a man that I've seen before include "Unopposed" , "All united-males only?" , "all of us" , "All without exception - excluding women?" .)
(Other definitions for unopposed that I've seen before include "without query" , "Without challenge" , "so carried?" , "Not challenged" , "Without resistance or other contenders" .)
'unanimously' is the definition.
(I've seen this in another clue)
This is all the clue.