What was foreshadowed by Percival Lowell initially before bowing out? (5)
I believe the answer is:
pluto
'out?' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for pluto that I've seen before include "Disney character - Underworld god - planet" , "Planet beyond Neptune" , "Planet discovered in 1930" , "wartime acronym" , "Solar system body" .)