Supports prop for first scrum (6)

I believe the answer is:

braces

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'supports' is the definition.
(brace is a kind of support)

I don't understand the remainder of the clue.

(Other definitions for braces that I've seen before include "They hold up men's trousers" , "straps to hold your trousers up" , "Tighten" , "bolsters" , "Supports for teeth or trousers" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.

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