How do I clear "other" in my iphone's memory?

I bought something on Itunes on my iphone and it won’t download. I think the problem is that I don’t have enough free space on my phone for it to download. I’ve removed all my music and photos, but but my free space stays the same. It says I have 1.63 GB of “other” which I can’t seem to get rid of. Someone told me it’s from interrupting a sync. Anyone know how to fix this problem?