A metal fastening possibly coming in various shapes (4)

I believe the answer is:

hasp

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'fastening possibly coming in various shapes' is the definition.
'hasp' can be an answer for 'fastening' (I've seen this in another clue). I'm not sure about the 'possibly coming in various shapes' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for hasp that I've seen before include "Door latch" , "Hinged fastening" , "Fastening plate, clasp" , "Hinged fastener for door or lid" , "This part of fastening device" .)

I've seen this clue in the Evening Standard.

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