Crossword Genius

Make a drastic capital cut? (6)

Ross

I believe the answer is:

behead

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

'make a drastic' is the definition.
I can't tell whether this defines the answer.

'capital cut?' is the wordplay.
I cannot really see how this works, but
'capital' could be 'head' and 'head' is found within the answer.
The remaining letters 'be' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for behead that I've seen before include "wield the axe" , "Remove the crown" , "Knock someone's block off?" , "Top" , "Remove cranium as in old execution" .)

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