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And not the last sightings of Captain Horatio Hornblower (3)

Ross

I believe the answer is:

nor

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'and not' is the definition.
('nor' means 'and also not')

I can't explain the remainder of the clue.

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(Other definitions for nor that I've seen before include "In addition, not" , "Negative word" , "And not either" , "Neither one ... the other" , "It's also not" .)

I've seen this clue in The Independent.
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