One partial to fish, Ruth has no starter (5)
I believe the answer is:
egret
'one' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for egret that I've seen before include "Lesser white heron" , "Type of heron" , "One of a pair of waders" , "white fish eater" , "Type of forty eight Ac" .)