How do you cut a hole contained by a clay wall-tile? This is so the tile fits 'seamlessly' round a fitting, such as...

This is so the tile fits 'seamlessly' round a fitting, such as a plug socket.
Answers:    this is not just a event of making a hole in a tile ..as a builder for forty years plus ..here's how i do it first i sitting duck the tile very accurately ...later with my tile cutter i scribe a queue all around the nouns i want removed ..then i hold this ..thing ...its resembling a g clamp but with a hole surrounded by the middle .i tighten this on to the tile over the area to be removed ...afterwards with the other bit of the gear ...a hammer next to a point on it ..i knock a hole in the tile ..where on earth the clamp grips the tile tight it does not break or crack ..have never broken one ..afterwards once the hole is made its big enough for me to go and get my tile snips in and next its just a overnight case of nibble bite til you get to the scribed lines ..works every time ..i bought this clamp from a tile shop
You enjoy to use a bit made especially for that, you can rent them at tool rent centers.