Final answer:
The figure of speech in the line is metonymy, representing regret over a period of time or event. Its inner meaning suggests gaining value from regrettable situations, possibly by learning or finding a positive aspect.
Step-by-step explanation:
The line
'and saved some part of a day I have rued'
employs the figure of speech known as
metonymy
. Metonymy is a figure of speech where a thing or concept is not called by its own name, but by the name of something closely associated with it. In this context, a 'day' is used to represent a period of time or an event, which the speaker regrets ('rued'). The inner meaning of this line may suggest that the speaker has been able to salvage or gain some value ('saved') from a situation or time period that they otherwise regret or feel negative about. This could apply to a range of scenarios, such as learning an important lesson from a mistake, finding a silver lining in a challenging situation, or making meaningful progress despite difficulties.
Learn more about Metonymy