Crossword Genius

Tear fastener (3)

Ross

I believe the answer is:

zip

I believe this is a double definition.

'tear' is the first definition.
(I know that tear can be written as zip)

'fastener' is the second definition.
(I know that zip is a type of fastener)

(Other definitions for zip that I've seen before include "Toothed fastener" , "Locking device with two toothed edges and a sliding tab" , "Sound of bullet passing" , "Energy or clothes fastener" , "Fastening device" .)

I've seen this clue in The Times.
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