Crossword Genius

Bringing up a child causes … (7,8)

Ross

I believe the answer is:

morning sickness

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'bringing up' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Another definition for morning sickness that I've seen is " Expecting trouble".)

I've seen this clue in The Sunday Times.
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