Crossword Genius

Pull up after intervention of University security officer (5)

Ross

I believe the answer is:

guard

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'pull' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

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(Other definitions for guard that I've seen before include "security man" , "Police" , "Shield" , "Protect" , "Sentinel" .)

I've seen this clue in The Times.
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