Reposition soldiers on island, for example moving north (9)

I believe the answer is:

rearrange

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But I can't explain it at all! Could you help me understand?

(Other definitions for rearrange that I've seen before include "Give another order" , "Adjust" , "What 8 [ADJUSTER] may do" , "Make an anagram of" , "Alter" .)

I've seen this clue in The Times.

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