Crossword Genius

How you chuck it away when the injured arm has mended? (5)

Ross

I believe the answer is:

sling

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'it away when the injured arm has mended?' is the definition.
The definition suggests a singular noun which matches the answer.

I cannot understand how the rest of the clue works.

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(Other definitions for sling that I've seen before include "shy" , "Old weapon or supporting strap" , "Move off!" , "Catapult or support as for injured arm" , "throwing implement like catapult" .)

I've seen this clue in the Evening Standard.
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