Kindly Vulcan, upset about uniform, stripped bare (9)

I believe the answer is:

avuncular

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'bare' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

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(Other definitions for avuncular that I've seen before include "Of an uncle - friendly" , "Kind and friendly, like Remus" , "Kind and friendly towards a younger or less experienced person" , "Genial" , "Kind and indulgent" .)

I've seen this clue in The Independent.

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