Going without a word that's understood (5)

I believe the answer is:

tacit

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'that's understood' is the definition.
(I've seen this in another clue)

I don't understand how the remainder of the clue works.

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(Other definitions for tacit that I've seen before include "Implied without being put into words" , "Respect, admiration" , "Implied without being said" , "without speaking" , "Understood without being directly expressed" .)

I've seen this clue in the Evening Standard.

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