Lacking sense (9)

I think it could be either:

Which length description are you looking for?:

illogical

'lacking sense' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for illogical that I've seen before include "lacking sense" , "Unreasonable" , "silly" , "Lacking sound reasoning" , "Having no base" .)

I've seen this clue in the Sydney Morning Herald.

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