No objections in job description that requires a plumber (4)

I believe the answer is:

drip

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'no objections in job description that requires a plumber' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

This is all the clue.

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(Other definitions for drip that I've seen before include "See 6" , "Weed - seep" , "Fall as from leaky tap" , "Intravenous administration of solution" , "Gradual fall of liquid" .)

I've seen this clue in the Irish Times.

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