This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
覠 combines 君 (lord, ruler) and 見 (see). The exact historical development is uncertain, but it likely originally expressed a ruler's inspection or observation.
A lord (君) seeing (見) his domain: imagine a ruler inspecting his lands, though the exact meaning is unclear.
For キン, imagine a keen-eyed lord inspecting his kingdom: keen -> キン, and the lord sees all.