Does rhubarb feel so? (6)

I believe the answer is:

sticky

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'so?' is the definition.
Both the definition and answer are adjectives. Maybe there's an association between them I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for sticky that I've seen before include "Awkward - viscous" , "Viscous - problematic" , "Adhesive - muggy" , "Twiggy" , "Gluey, gooey" .)

I've seen this clue in the Evening Standard.

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