Crossword Genius

Fixing device you can't see the point of? (6,3)

Ross

I believe the answer is:

safety pin

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

I can't explain the remainder of the clue.

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(Other definitions for safety pin that I've seen before include "This should not be removed" , "Grenade release mechanism" , "Fastening device with protective catch" , "Metal fastener" , "Simple fastener" .)

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