Andrew
I fish a lake where I often fish clipped up for accuracy, throwing a cast about 40 yards. Occasionally, along comes a carp that necessitates getting the line unclipped. I agree with Phil in that its really important to put a few turns of line on the reel after casting to give yourself a little breathing space - however, I've got away with two turns on the last few sessions and never had a problem. The thing is, the feel of the bigger fish stands out a mile (particularly if you've been catching skimmers and small roach previously) As soon as you feel the extra weight of a running carp, flip the bail arm, raise the rod to take the extra couple of turns off, and then unclip the line. Then close the bail arm and play the fish as usual. I know this sounds like you're taking a big risk of the fish smashing a tight line, but in pratice (providing you're using mono line with a bit of stretch, 6lb sensor in my case) you have loads of time to get this done before the lines properly tight. Like any action, practice makes perfect - have a few gos at completing what I've decsribed above without a fish on. As an aside, several times I've known from the bite on the tip that I';d be unclipping, as an 8lb carp doesn't piddle about as much as a 6 oz skimmer!! Good luck!