Crossword Genius

The sea bass has been dropped outside once (4)

Ross

I believe the answer is:

rine

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'outside once' 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 rine that I've seen before include "outside once" , "Old crust" .)

I've seen this clue in The Sunday Times and The Times.
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