Humble frump, relinquishing booze, lectures drunk (10)

I believe the answer is:

respectful

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'humble' is the definition.
(thesaurus)

I don't understand how the rest of the clue works.

(Other definitions for respectful that I've seen before include "Showing due regard for others" , "Showing due deference" .)

I've seen this clue in The Times.

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