There is a default feature on Nexus 7 with Jelly Bean 4.3 that clear the cached data for all app at once, without installing any third party apps. To clear cache on Nexus 7 2013 do as follows:
1. Open Settings application
2. Go to Storage.
3. Tap on Cached Data and confirm the "Clear Cached Data" process
To clear the cached data for applications individually, go to Settings > Apps > Open an Application > Tap Clear Cache button