Crossword Genius

Thumbs up, Badenoch predominantly struck dumb (5)

Ross

I believe the answer is:

shtum

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'dumb' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for shtum that I've seen before include "silence" , "Quiet" , "Silent, dumb (sl.)" , "Silent, non-communicative" , "tight-lipped" .)

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