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There is a crankcase ventilation tube connecting the airbox to the engine. What happens is, during ignition, some gases will blow by the piston rings to inside the crankcase. When your oil level is above one of the crankcase ventilation ports (which would not happen unless it was overfilled), the gases will force oil out and into the airbox.
The clear hose is meant to trap any oil that gets kicked up during normal operation (the crankcase ventilation is SUPPOSED to be rerouted to the airbox so any unspent fuel gets burned), but since the engine has been overfilled, the oil is finding its way there.
Drain some oil with the oil drain plug, then recheck your oil level with the dipstick. The interiors of all the ventilation tubing now have a coat of oil, and it may be a while before it is all expelled.
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