Apple Final Cut Pro 6 - Manual (Page 1005)

220 Part II Effects
m Open a sequence clip in the Viewer, then do one of the following:
 Choose Effects > Video Filters, then choose a filter from the submenus.
 Drag a filter from the Effects tab of the Browser directly into the Viewer.
You can apply a filter to an entire clip or just part of a clip.
...to the sequence clip
in the Viewer.
Drag the filter from
the Browser...