Swaps third husband with magical ladies (8)

I believe the answer is:

switches

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

'swaps' is the definition.
(I know this)

'third husband with magical ladies' is the wordplay.
'third husband' becomes 's' (crd letter of 'husband').
'with' becomes 'w' (abbreviation).
'magical ladies' becomes 'itches' (I can't justify this - if you can you should believe this answer much more).
's'+'w'+'itches'='SWITCHES'

Can you help me to learn more?

(Another definition for switches that I've seen is " changes".)

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

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.