Deal with someone with a complaint (5)

I believe the answer is:

nurse

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'deal' is the definition.
The definition and answer can be both to do with social activities as well as being verbs in their base form.
Perhaps they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for nurse that I've seen before include "Type of shark" , "Feed" , "Trained carer" , "drink slowly" , "Nanny" .)

I've seen this clue in The Globe and Mail, The Irish News and The Irish Independent.

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