Crossword Genius

Collapsible shield? (7)

Ross

I believe the answer is:

buckler

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'shield?' is the definition.
(I know that buckler can be written as buckler)

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

Can you help me to learn more?

(Other definitions for buckler that I've seen before include "Small round shield" , "likely to give way under pressure?" , "gives way under pressure?" , "Small shield for the forearm" .)

I've seen this clue in The Sun.
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