Sticky French screw detective group (6)

I believe the answer is:

viscid

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'sticky' is the definition.
(synonyms)

I don't understand how the remainder of the clue works.

(Other definitions for viscid that I've seen before include "Of a consistency like treacle" , "Glutinous, sticky" , "Of liquid, thick and gluey" , "Having the properties of glue" , "Sticky, gluey" .)

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

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