God in sink water? (8)

I believe the answer is:

raindrop

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'water?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'god in sink' is the wordplay.
'god' becomes 'Ra' (Egyptian god).
'sink' becomes 'drop' (synonyms).
'ra'+'in'+'drop'='RAINDROP'

Can you help me to learn more?

(Other definitions for raindrop that I've seen before include "Part of a shower" , "marks start of downfall?" , "Having a bit of a fall" , "tiny amount of water" , "Unit of moisture precipitated from sky" .)

I've seen this clue in The Hindu.

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