Crossword Genius

Anything said to come from Portsmouth (5)

Ross

I believe the answer is:

aught

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'anything' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for aught that I've seen before include "Anything at all (archaic)" , "Emphatically anything" , "Nothing" , "Anything (Shakespearean)" .)

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