"Land After" is a very useful clearance.
It allows "Clear to Land" to mean that the controller takes responsibility for giving you the whole runway but still allows common sense to apply, particularly on long or very long runways where I can already see enough empty concrete to land safely.
LHR 9L is as an example.
If I land my 747 early in the morning heading for T4, I prefer to be a good neighbour and use only idle reverse. I can clear at the high speed exit (Block 17 or whatever it's called this week) but my minibus colleague behind heading for Shuttle has plenty of room to land and take his turning even if I am technically infringing his runway as he touches down.