Conclude there's no getting away from Hades (5)

I believe the answer is:

infer

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'conclude' is the definition.
(inferring is a kind of concluding)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for infer that I've seen before include "Deduce (from evidence)" , "Deduce logically" , "Establish by deduction" , "Insinuate" , "come to a conclusion" .)

I've seen this clue in The Globe and Mail.

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