Acts as executioner. Some teachers want to! (7)

I believe the answer is:

beheads

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

'want to' is the definition.
I can't tell whether this defines the answer.

'acts as executioner some teachers' is the wordplay.
'acts as' becomes 'b' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'some' says to take the initial letters.
'teachers' becomes 'heads' (head or headteacher is a type of teacher).
The initial letter of 'executioner' is 'e'.
'b'+'e'+'heads'='BEHEADS'

Can you help me to learn more?

(Another definition for beheads that I've seen is " Decapitates".)

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

Want a hint initially instead of a full solution? Install my app