What does "be clear to" mean in this sentence?
-You're clear to land.
-Roger, I'm coming in to land now

Question

Answer

I think it should be "cleared to land."

Answer

The full expression you are alluding to is the concept of "being clear to do something", which means that there isn't anything blocking or stopping the ability to complete that action.

Answer

I believe it means "You're allowed to land"

Answer

It means that there is nothing preventing him from landing:
the way is clear 
you are clear to go
there is nothing impeding you

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