Regular change in Pole's former name for city (14)

I believe the answer is:

constantinople

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

'for city' is the definition.
(Constantinople is an example)

'regular change in pole's' is the wordplay.
'regular' becomes 'constant' (I've seen this before).
'change' indicates an anagram.
'in'+'pole'='inpole'
'inpole' is an anagram of 'inople'.
'constant'+'inople'='CONSTANTINOPLE'

'former name' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for constantinople that I've seen before include "seat for emperor" , "Istanbul formerly" , "capital no longer used" , "place that changed its name" , "Former name of Istanbul" .)

I've seen this clue in The Daily Express.

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.