If you have no free play i the linkage, the clutch can slip. If the reason for no free play is that you are at the end of the adjustment, then it is time for a new clutch. If there is still adjustment, then adjust it and you should be good to go.
Note: 'free play' means the distance from when you start to move the clutch until the time that the clutch actually starts to disengage. You can think of it as the slop. Only the linkage is moving while all of the slack is taken up. Then, the clutch lever actually starts to release the clutch disc. The reason for free play is to ensure that the clutch is fully engaged. If you adjust for too much free play, then the clutch might drag during shifts as the disk is not releasing enough.