Crossword Genius

Overly affectionate mother's job can stay unfinished (7)

Ross

I believe the answer is:

jocasta

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'overly affectionate mother's job' is the definition.
The definition suggests a singular noun which matches the answer.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Another definition for jocasta that I've seen is " tragic queen".)

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