Crossword Genius

Material for a cracker (8)

Ross

I believe the answer is:

whipcord

I'm a little stuck... Click here to teach me more about this clue!

'material' is the definition.
(I know that whipcord is a type of material)

I can't explain the rest of the clue.

Can you help me to learn more?

(Another definition for whipcord that I've seen is " beating fabric?".)

I've seen this clue in The Globe and Mail.
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