Fasteners in zigzag form? (5)
I believe the answer is:
tacks
'fasteners' is the definition.
(tack is a kind of fastener)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for tacks that I've seen before include "Approaches" , "Fixes" , "Drawing pins" , "Short nails" , "They secure" .)