I *believe* you can accomplish this. You will need to connect your iPoD headphone jack to the aux input on the Clarion (while I don't know the specifics of the Clarion, I think it should have an aux input). Now, the $100k question: does the Clarion have bluetooth? If so, you should be able to pair it with a bluetooth speaker for your outdoor audio.
Without knowing the specifics of your system, this is my best SWAG.