Lead guillotine? (6)
I believe the answer is:
behead
'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" .)