Inseparable (5)

I think it could be either:

Which length description are you looking for?:

thick

'inseparable' is the definition.
(thesaurus)

This is the entire clue.

(Other definitions for thick that I've seen before include "deficient in understanding" , "Foolish" , "Crowded" , "Stupid (as two short planks?)" , "Wide, broad" .)

I've seen this clue in the LA Times.

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