Yes, you're right, the answer is : OUTLANDISH. Well done !
4. Foreign student among one thousand in confusion - very,very strange (10) O - - - - - - I - -
Here's the breakdown.
First, the meaning :- - "Very, very strange" is one meaning, but the word "outlandish" or "out-of-the-land"
is an archaic term for "foreign". It is a straight translation of, and no doubt comes from, the German word "ausländisch", which is their normal, everyday word for "foreign".
So, the clue means, "foreign".
The phrase, "in confusion" is not there to confuse, but to indicate an anagram.
The anagram is made up from : L (student) . . . I (from the number ONE) . . and T-H-O-US-A-N-D
all of which spell out : OUTLANDISH