How witches might see a microwave (5)

I believe the answer is:

coven

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

'how witches' is the definition.
'coven' can be an answer for 'witches' (I've seen this before). I am not sure about the 'how' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for coven that I've seen before include "Witches' assembly" , "Charming women" , "group for spells" , "Witch group" , "Company of witches" .)

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.