Final answer:
The notion of being 'homeless at home' refers to feeling displaced or out of place even in familiar surroundings, often due to personal history or psychological reasons, rather than the lack of a physical dwelling.
Step-by-step explanation:
The notion that Clare feels about being "homeless at home" refers to the feeling of displacement even in one's own place or familiar surroundings. This sentiment encapsulates the experience of not belonging or feeling out of place, even when in a place that should represent comfort and familiarity.
It's not the literal absence of a physical dwelling, as in being without a home, nor is it about being homeless in a foreign country, or feeling out of place in someone else's home. Instead, the notion encompasses a deeper, more psychological sense of alienation and disconnection from one's surroundings, which may be due to a variety of factors including personal history, current living conditions, or a mismatch between an individual's expectations and reality.