Union body sign for insurance company specialists? (9)

I believe the answer is:

actuaries

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But I can't explain it at all! Could you help me understand?

(Other definitions for actuaries that I've seen before include "They know about risks" , "They calculate insurance premiums" , "They calculate insurance risks" , "Experts in calculations for insurance companies" , "Financial experts" .)

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

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