... and not mandarin orange segment (3)

I believe the answer is:

nor

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

'mandarin orange segment' is the wordplay.
'NOR' is hidden in amongst the letters.
But, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for nor that I've seen before include "Negative word" , "And not either" , "Negative conjunction" , "Link word" , "Conjunction meaning 'and not'" .)

I've seen this clue in The Independent.

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