Crossword Genius

Dotty teetotaller immersed in water! (5)

Ross

I believe the answer is:

batty

'dotty' is the definition.
('batty' can be a synonym of 'dotty')

'teetotaller immersed in water' is the wordplay.
'teetotaller' becomes 'tt' (abbreviation).
'immersed in' indicates putting letters inside.
'water' becomes 'bay' (bay is a kind of water).
'tt' inserted inside 'bay' is 'BATTY'.

(Other definitions for batty that I've seen before include "Eccentric" , "Dotty!" , "out to lunch" , "Seemingly descriptive of vampire" , "As mad as a mouselike mammal" .)

I've seen this clue in the Evening Standard.
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