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Rowing crew, we hear, as in the Thames (4)

Ross

I believe the answer is:

eyot

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'rowing' is the definition.
Both the answer and definition are singular nouns.
Perhaps there's an association between them I don't understand?

I don't understand how the rest of the clue works.

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

I've seen this clue in the Evening Standard.
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