Crossword Genius

It extended W holder (4)

Ross

I believe the answer is:

rack

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'holder' is the definition.
(thesaurus)

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

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(Other definitions for rack that I've seen before include "Rib section of lamb" , "giving rise to anxiety" , "Storage frame; draw off (wine)" , "Support" , "Driving mist" .)

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