Superintendent close to entrance stopping joyrider? (9)

I believe the answer is:

caretaker

'superintendent' is the definition.
(superintendent can mean a caretaker or janitor)

I can't explain the rest of the clue.

(Other definitions for caretaker that I've seen before include "Janitor" , "exercising temporary control" , "Temporarily in charge" , "School worker, perhaps" , "Custodian, keeper" .)

I've seen this clue in The Guardian.

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