Backbone (5)

There are a few possibilities for this:

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6,6 9,6

spine

'backbone' is the definition.
(synonyms)

This is all the clue.

(Other definitions for spine that I've seen before include "Strength of character" , "Line of vertebrae" , "Series of vertebrae" , "Part of book's jacket" , "Vertebrae, complete" .)

I've seen this clue in The Mirror, the USA Today, the King Feature Syndicate, The Star Tribune, the Newsday, the Penny Press, The Independent, The Telegraph, the Evening Standard, The Wall Street Journal and The Times.

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