Crossword Genius

Prove you are the boss - as Henry VIII did (6)

Ross

I believe the answer is:

behead

I'm a little stuck... Click here to teach me more about this clue!

'henry viii did' is the definition.
I can't judge whether this definition defines the answer.

'prove you are the boss' is the wordplay.
'prove you' becomes 'be' (I am not sure about this - if you are sure you should believe this answer much more).
'are the boss' becomes 'head' (I've seen this before).
'be'+'head'='BEHEAD'

'as' acts as a link.

Can you help me to learn more?

(Other definitions for behead that I've seen before include "Knock one's block off!" , "Guillotine" , "Knock someone's block off?" , "Remove the crown" , "wield the axe" .)

I've seen this clue in The Globe and Mail.
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