Crossword Genius

Policeman to prohibit a vehicle attachment (7)

Ross

I believe the answer is:

bullbar

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'a vehicle attachment' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'policeman to prohibit' is the wordplay.
'policeman' becomes 'bull' (bull is a kind of policeman).
'to prohibit' becomes 'bar' (to bar is to ban or prohibit).
'bull'+'bar'='BULLBAR'

Can you help me to learn more?

(Another definition for bullbar that I've seen is " Vehicle's impact protector".)

I've seen this clue in the Sydney Morning Herald.
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