Component (a building block) — not the same thing as a radical or a sound component. · 2strokes
允元兄充兆先克免
Kangxi radical no.10 · 2strokes — The 214 Kangxi radicals
Filed under it in a dictionary. That is a lookup convention — it does not mean it is the only part the character is built from.
儿允元兄充兆先光