When a clip is deleted in Filmic Pro, it is marked for deletion by the device. There is no way to directly recover the file on the device. In some cases, the clip may be intact if your device has not tried to reuse that hard drive space for something else. In instances like this, it may be possible to recover the clip with data recovery software.
In our experience, recovering deleted clips with data recovery software has a relatively low success rate. However, if you are interested in trying out some data recovery software, here's an article that lists some useful options.