Off-the-wall, like one of Seurat's paintings? (5)

I believe the answer is:

dotty

This clue is a double definition.

'off-the-wall' is the first definition.
(dotty can mean off-the-wall or mad)

'like one of seurat's paintings?' is the second definition.
(Georges Seurat's paintings involve lots of dots)

(Other definitions for dotty that I've seen before include "like a Dalmatian?" , "Silly; crazy" , "Mildly eccentric" , "Barking" , "Slightly crazy" .)

I've seen this clue in The Times.

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