This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
鏊 combines 敖 (top) and 金 (metal). The exact historical development is uncertain, but it likely relates to a metal cooking vessel, given the kun reading やきなべ (frying pan).
The top component 敖 suggests a person with a stick, and the bottom 金 is metal. Imagine a metal frying pan (やきなべ) being stirred with a stick.
For ギョウ, imagine a chef named Gyo using a metal frying pan: Gyo -> ギョウ, and the pan is 鏊.