Ample igloos spread around large city (11)

I believe the answer is:

megalopolis

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

'large city' is the definition.
'megalopolis' can be an answer for 'city' (I have seen 'Big city' mean 'megalopolis' so perhaps 'city' could also mean 'megalopolis'). I am not certain of the 'large' bit.

'ample igloos spread' is the wordplay.
'spread' indicates an anagram.
'ample'+'igloos'='ampleigloos'
'ampleigloos' anagrammed gives 'MEGALOPOLIS'.

'around' acts as a link.

Can you help me to learn more?

(Other definitions for megalopolis that I've seen before include "Big city" , "Large conurbation" , "Group of large towns close together" , "city complex" .)

I've seen this clue in The Daily Express.

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