Dealt with patiently? (7)

I believe the answer is:

treated

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'dealt with' is the definition.
('treat' can be a synonym of 'deal with')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for treated that I've seen before include "Provided remedies for" , "Behaved towards" , "Attended to" , "Gave medical care" , "taken out" .)

I've seen this clue in The Sun.

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