Crossword Genius

Semi-hardy hairpiece (3)

Ross

I believe the answer is:

rug

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'hairpiece' is the definition.
(rug is a kind of hairpiece)

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

Can you help me to learn more?

(Other definitions for rug that I've seen before include "Wig (informal)" , "Mat or knee-cover" , "A bug may be snug in it" , "Small carpet" , "Hairpiece" .)

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