Van may have this protection behind (5)

I believe the answer is:

guard

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This clue might be a double definition.

'van' is the first definition.
(thesaurus)

'have this protection behind' is the second definition.
'guard' can be an answer for 'protection' (thesaurus). I am not sure about the remainder of the definition.

'may' acts as a link.

Can you help me to learn more?

(Other definitions for guard that I've seen before include "One keeps watch" , "Yeomen" , "Protection" , "Escort" , "Protect" .)

I've seen this clue in The Telegraph.

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