Crossword Genius

The Maori welders somehow endured the heat (9)

Ross

I believe the answer is:

sweltered

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'endured the heat' is the definition.
Although both the answer and definition are past participle verbs, I cannot understand how one could define the other.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for sweltered that I've seen before include "Suffered from great heat" , "suffered in the hot weather?" , "Suffered from excessive heat" .)

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