Crossword Genius

Fasteners in zigzag form? (5)

Ross

I believe the answer is:

tacks

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'fasteners' is the definition.
(tack is a kind of fastener)

I can't explain the remainder of the clue.

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(Other definitions for tacks that I've seen before include "Approaches" , "Fixes" , "Drawing pins" , "Short nails" , "They secure" .)

I've seen this clue in the Evening Standard.
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