Can a Catholic priest take Anglican services?

I was having a discussion with someone and I said that if a Catholic priest took a Protestant service, it would not be bona fide Protestant service. They replied that Catholic priests *can* become Anglican members. Which makes me wonder if I was wrong: can a Catholic priest lead Anglican services; and which services (if any) would not be bona fide Protestant when performed by a Catholic priest? Please do answer based on whichever Anglican church would say the service really was Protestant.