has proved the clincher

VicNicSor

Banned
Russian
clincher
A clincher is a fact or argument that finally proves something, settles a dispute, or helps someone achieve a victory. [INFORMAL]
DNA fingerprinting has proved the clincher in many criminal and other forensic identifications.
Collins Cobuild

"A clincher is a fact or argument that finally proves something" - is ok,
but
"Something proves the clincher" -- how do I understand that?
I'd expect:
DNA fingerprinting has been/become the clincher in many criminal and other forensic identifications.

Thanks.
 
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