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One partial to fish, Ruth having no starter (5)

Ross

I believe the answer is:

egret

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'one' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

I can't explain the rest of the clue.

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(Other definitions for egret that I've seen before include "Mainly white heron" , "Wader with white plumage" , "Kind of heron with long white feathers" , "young bird" , "Stork-like bird" .)

I've seen this clue in The Sun.
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