Conclude there's no getting away from Hades (5)
I believe the answer is:
infer
'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" .)