Self-storage rental (4)

I believe the answer is:

unit

'self-storage rental' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for unit that I've seen before include "Kitchen element?" , "Subdivision of a whole" , "Single item; one" , "Whole - group" , "Operational team" .)

I've seen this clue in the USA Today, the Newsday.com, the Newsday, the LA Times, the Universal and the Family Time.

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