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I fell off seat having fish (4)

Ross

I believe the answer is:

char

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'fish' is the definition.
(char is a kind of fish)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for char that I've seen before include "Fish < tea" , "Singe, scorch" , "'Mrs Mopp'" , "(Work as a) cleaner" , "Tea - cleaning lady" .)

I've seen this clue in The Hindu.
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