Crossword Genius

Fish bishop's left in streamlet (4)

Ross

I believe the answer is:

rill

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'streamlet' is the definition.
(synonyms)

I can't explain the rest of the clue.

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(Other definitions for rill that I've seen before include "Small stream" , "Flowing water" , "Brooklet" , "Little stream" , "Small brook" .)

I've seen this clue in The Telegraph.
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