Like a rough diamond when sober? (5)

I believe the answer is:

uncut

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'like' is the definition.
Both the definition and answer are adjectives. Perhaps you can see a link between them that I can't see?

I don't understand the remainder of the clue.

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(Other definitions for uncut that I've seen before include "as originally intended" , "Not abridged" , "Without abridgement" , "diamonds, originally" , "(Of a diamond) rough" .)

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