How can I clear other storage on my iPhone

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To start answering your question, “Other” is all data on your phone that doesn’t fit into the listed categories. It can include data for built in applications, caches, iOS system data, images that haven’t been processed and other stuff. Normally Other will be relatively small, compared to the total storage on the phone. if its size starts to fill up the phone then there is storage corruption on the phone. To clear the corruption back up the phone restore it to factory settings, then restore the backup you just made.

1. How to back up your iPhone, iPad, and iPod touch - Apple Support
2. Restore your iPhone, iPad, or iPod to factory settings - Apple Support - follow the instructions to restore using your computer, do not using Settings/General/Reset (which is not included in those instructions)
3. Restore your iPhone, iPad, or iPod touch from a backup - Apple Support