Crossword Genius

Lead guillotine? (6)

Ross

I believe the answer is:

behead

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

'guillotine?' is the definition.
(guillotining is a kind of beheading)

'lead' is the wordplay.
I cannot quite see how this works, but
'lead' could be 'head' (synonyms) 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 understand.
This explanation may well be incorrect...

Can you help me to learn more?

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

I've seen this clue in the Sydney Morning Herald.
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