Fastidious

I think it could be either:

Which length description are you looking for?:

neat

'fastidious' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for neat that I've seen before include "Clever" , "efficient" , "Tidy, well-ordered" , "avoiding water?" , "well-kept" .)

I've seen this clue in The New York Times.

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