depending on what you want to edit here are two ways of doing it.
1. Turn off snap to grid..Click on your snap to grid button on the menu bar that is attached to the top of your track views. This will allow you to click on items other than the pre-set time measure. for example if its set on whole measures your mouse will automatically select the closest measure start/end. Now that snap to grid is off click on the magnifying glass with the "+" on the bottom right of the view window. clicking this multiple times will allow you to stretch out the view vertically so you can see more audio wave detail. Now once you see where your offendinf mistake is you can right click right before or right after it and select "Split Clip". You can either Split the clip on both ends of your mistake and simply highlight and delete it....or if you only split the clip on one side of your foul-up you can grab the edge of your clip by right-clicking on it and dragging it past your bad spot. This removes it from your view and it will play. Also anytime you split you can also drag the nre split edge and still recover the data you split from it. just play with it.
2. With snap to grid on......split the clip as described above so you have the measure or mesaures in question in its own little bubble/clip. Double click on that clip and the loop editor window will open. once you are in it, it is your basic editor....cut/paste/delete...the usual. the changes will take place on your clip when you exit the loop window.
hopefully this might help. The key is to isolate the section first then you can eq it, comp it, delete...etc.
