Crossword Genius

Worship with water coming in? That's completely stupid (9)

Ross

I believe the answer is:

brainless

'completely stupid' is the definition.

'worship with water coming in?' is the wordplay.
'worship with' becomes 'bless' (I am not sure about this - if you are sure you should believe this answer much more).
'water' becomes 'rain' (rain is a kind of water).
'coming in?' indicates putting letters inside.
'bless' enclosing 'rain' is 'BRAINLESS'.

'that's' acts as a link.

(Other definitions for brainless that I've seen before include "dim" , "Devoid of intelligence" , "Stupid, foolish" , "Silly" .)

I've seen this clue in The Guardian.
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