Crossword Genius

Fine linen in two-thirds of university clubs (7)

Ross

I believe the answer is:

cambric

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

I can't explain the rest of the clue.

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(Other definitions for cambric that I've seen before include "Thin linen or cotton cloth" , "Fine white linen" , "light cloth" , "Material" , "Lightweight cotton or linen cloth" .)

I've seen this clue in The Telegraph.
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