Returned kiss on vacation with Ray on Channel Island's major conurbation (11)

'major conurbation' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'returned kiss on vacation with ray on channel island's' is the wordplay.
'returned' says the letters should be written backwards.
'on vacation' says to hollow out the word (remove centre letters) (after the inside letters have vacated the word).
'with' says to put letters next to each other.
'ray on' becomes 'rayon' (I can't explain this - if you can you should believe this answer much more).
'channel island' becomes 'Sark' (Sark is one of the Channel Islands).
'kiss' with its centre taken out is 'ks'.
'ks'+'rayon'+'sark'='ksrayonsark'
'ksrayonsark' backwards is 'KRASNOYARSK'.

Can you help me to learn more?