Crossword Genius

Sticky couple of marks in potter's raw material (6)

Ross

I believe the answer is:

clammy

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

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for clammy that I've seen before include "Moist and adhesive" , "Stewing" , "Unpleasantly cool and humid" , "Wet and sticky" , "Dank" .)

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