Tackled the problem when one spoke to (9)

I believe the answer is:

addressed

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'one spoke to' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

(Other definitions for addressed that I've seen before include "Spoken to" , "as post should be" , "Gave a speech to" , "Dealt with" , "Gave attention to a problem" .)

I've seen this clue in the Evening Standard.

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