Fastening for a strap (6)

I believe the answer is:

buckle

(Other definitions for buckle that I've seen before include "(E.g. belt) fastener; crumple" , "Bend out of shape" , "cave in under pressure?" , "Crumple under pressure, or belt fastener" , "It's attached to a belt or shoe" .)

I've seen this clue in The Guardian.

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