Sun's nice and relaxing — but could this presage a change? (4,5)

I believe the answer is:

rain dance

'could this presage a change?' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'sun's nice and relaxing' is the wordplay.
'sun' becomes 'Ra' (ancient Egyptian sun god).
'relaxing' indicates anagramming the letters.
'nice'+'and'='niceand'
'niceand' with letters rearranged gives 'indance'.
'ra'+'indance'='RAIN DANCE'

'but' acts as a link.

I've seen this clue in The Guardian.

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