Some macho axe-wielding fool (4)
I believe the answer is:
hoax
'fool' is the definition.
(thesaurus)
'some macho axe-wielding' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'HOAX' is hidden in the letters of 'macho axe wielding'.
(Other definitions for hoax that I've seen before include "Scam" , "A joking kind of deception" , "Deceptive trick, could be malicious" , "Deliberate trickery" , "Playful fraud" .)