Like "rssjsb" said, they are only considered a mated pair when they actually spawn and lay eggs. Most clowns (( once they settle into spawning )) will spawn every 2 weeks or so. My Clarkii pair and my pink skunk pair both are on 2 week schedules.
Getting them to spawn can take time, took my pink skunk pair about 2 years, whereas my Clarkii pair took about a year. Depends on the individual fish, their age and what species.
Raising the fry in a main tank isn't going to happen, if they don't get eaten when they hatch, they will starve to death. Would need to set up a rearing tank and raise food for the fry.