Somewhat macho, the admiral's a daredevil (7)
I believe the answer is:
hothead
'daredevil' is the definition.
(I know that daredevil can be written as hothead)
'somewhat macho the admiral's a' is the wordplay.
'somewhat' says the answer is hidden in the clue.
'HOTHEAD' is hidden in the letters of 'macho the admirals a'.
(Other definitions for hothead that I've seen before include "Excitable person" , "Person liable to get reckless impulses" , "maniac" , "Madcap" , "Quick-tempered person" .)