Crossword Genius

Spectral deity visiting E3? (7)

Ross

I believe the answer is:

rainbow

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

'spectral' is the definition.
(a rainbow is a spectrum)

'deity visiting e3?' is the wordplay.
'deity' becomes 'Ra' (Ra is an example).
'visiting' becomes 'in'.
'ew?' becomes 'bow' (I am not sure about this - if you are sure you should believe this answer much more).
'ra'+'in'+'bow'='RAINBOW'

Can you help me to learn more?

(Other definitions for rainbow that I've seen before include "Arc caused by refraction of the sun's rays (7" , "colours in the heavens" , "Iris was its goddess" , "in different colours" , "Polychromatic arc" .)

I've seen this clue in The Independent.
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