Temporary effect of a false tooth (7)

I believe the answer is:

stopgap

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'temporary' is the definition.
(a stopgap measure is a temporary one)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for stopgap that I've seen before include "Temporary measure" , "Temporary fix" , "A temporary or impromptu substitute" , "A temporary substitute or solution" , "Temporary expedient" .)

I've seen this clue in the Sydney Morning Herald.

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