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Eight said to be in the Thames, e.g., at Chiswick (4)

Ross

I believe the answer is:

eyot

I'm a little stuck... Click here to teach me more about this clue!

'eight' is the definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?

'said to be in the thames e g at chiswick' is the wordplay.
I cannot really see how this works, but
'said' could be 't' (I've seen this in other clues) and 't' is present in the answer.
'e' is found in the answer.
The remaining letters 'yo' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for eyot that I've seen before include "isle" , "Islet found in a river, (especially in England)" , "Fawlty Towers waiter" , "Little island in a river or lake" , "There's one at Chiswick" .)

I've seen this clue in the Evening Standard.
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