Changing a clip's data rate

I imported an MPEG into FCP 4.5, and though it's a PAL DV clip [720x576], it seems to have come in at a higher data rate than all my other clips [6.9MB/sec instead of 3.6]. This is making it difficult to play. How do I change the data rate down to 3.6MB/sec where it should be and where it will play properly?
g4 dual 1 ghz   Mac OS X (10.4.6)  

you can't just change the data rate willy-nilly. your problem stems from the fact that this is an mpeg - what flavour of mpeg - and it can't be an mpeg and PAL DV. you need to convert that to an editable form of video.

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