Deduce number escaping blaze (5)

I believe the answer is:

infer

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'deduce' is the definition.
(I know that deduce can be written as infer)

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 "Derive as a consequence" , "Deduce by reasoning" , "Work out" , "Take finer meaning from" , "Derive by reasoning" .)

I've seen this clue in The Telegraph.

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