Bores about not being drunk (5)

I believe the answer is:

sober

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'not being drunk' is the definition.
I can't judge whether this definition defines the answer.

'bores about' is the wordplay.
'about' indicates an anagram.
'bores' is an anagram of 'SOBER'.

Can you help me to learn more?

(Other definitions for sober that I've seen before include "Serious, thoughtful" , "Unfuddled" , "not moved" , "Abstemious in robes" , "Sensible - clear-headed" .)

I've seen this clue in The Daily Express and The Mirror.

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