Rubber wearers cavorting topless (6)

I believe the answer is:

eraser

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

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

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

(Other definitions for eraser that I've seen before include "Stationery item" , "Obliterator" , "It's used to rub out" , "Rubbing-out device" , "Implement for rubbing out" .)

I've seen this clue in The Sun and The Guardian.

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