Crossword Genius

God in London district creates atmospheric effect (7)

Ross

I believe the answer is:

rainbow

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

'atmospheric effect' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'god in london district' is the wordplay.
'god' becomes 'Ra' (Egyptian god).
'london district' becomes 'Bow' (area of London).
'ra'+'in'+'bow'='RAINBOW'

'creates' is the link.

Can you help me to learn more?

(Other definitions for rainbow that I've seen before include "Wide range of colours" , "weather feature" , "illusory hope?" , "All the colours of the spectrum" , "heavenly sight" .)

I've seen this clue in The Sun.
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