Crossword Genius

Oomph; fastener (3)

Ross

I believe the answer is:

zip

I believe this clue is a double definition.

'oomph' is the first definition.
(I've seen this in another clue)

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

(Other definitions for zip that I've seen before include "drive" , "Locking device with two toothed edges and a sliding tab" , "Energy or clothes fastener" , "Fastening device" , "required in open-and-shut case?" .)

I've seen this clue in The Telegraph.
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