In which Liz Truss has delivered? (8)

I believe the answer is:

monotone

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'in which liz truss has delivered?' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

This is all the clue.

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(Other definitions for monotone that I've seen before include "Sound of unchanging pitch" , "Flat and unchanging in pitch" , "Single unvaried sound level" , "Dull delivery" , "Sound of unvarying pitch" .)

I've seen this clue in The Independent.

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