Border chief suppressed two film ratings (6)

I believe the answer is:

margin

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'border' is the definition.
(I know that border can be written as margin)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for margin that I've seen before include "Edge, border, fringe" , "Boundary line or the area" , "Edge or space for error" , "Blank space around the edge" , "Periphery" .)

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

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