Keep your distance (7)

I believe the answer is:

reserve

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'distance' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

(Other definitions for reserve that I've seen before include "Keep for future use" , "8 [RESTRAINT]" , "Set aside - shyness" , "One on bench" , "Keep for someone - spare bod" .)

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