Dealing with someone with a complaint (7)

I believe the answer is:

nursing

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'dealing' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see an association between them that I can't see?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for nursing that I've seen before include "sister's career" , "Tending (patients)" , "Feeding baby" , "now a graduate profession" , "Medical vocation" .)

I've seen this clue in The Globe and Mail.

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