Literally, "of the clock", although nobody says that.  Specifies the hour on a twelve-hour clock, so eight o'clock is either eight a.m. or eight p.m.  See the special section on military time.

Not on the fortune-telling cards that have been dealt, that is, could have been a foreseeable event but it is not going to happen now.

To get someone on side is to get them on your side.  They approve of you now.

This is definitely a masculine serpent.

Goodbye.  Pronounced oo-oo-roo.

More than sufficient!