Split clips overlapping each other

I am a songwriter using resolve to make videos with my music . I have four clips in four panes of instruments playing ! I have tried to get the lead vocal in the centre of the other clips. This works for three of the clips but the fourth clip covers up a corner of the vocal clip . How can I get the fourth clip to hide behind the vocal clip ?

[Peter Chamberlain]

Is the vocal clip on the top video track?

Hi Peter

The vocal is not on the top video track ! If I move it there would that solve the problem ?

Thank you Peter ! That did solve the problem !