Wisdom and totally unlimited tact mums deny (6)

I believe the answer is:

acumen

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'wisdom' is the definition.
(good or wise judgement)

I don't understand the rest of the clue.

(Other definitions for acumen that I've seen before include "Sharpness, penetration, quickness of perception" , "Sharpness of mind, good for business" , "The ability to make good and quick decisions" , "Cleverness in business" , "Good judgment" .)

I've seen this clue in The Times.

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