A space not occupied by anything impressive (6)

I believe the answer is:

margin

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'a space' is the definition.
(I know that margin is a type of space)

I can't explain the rest of the clue.

(Other definitions for margin that I've seen before include "Blank space around a text" , "Periphery" , "Blank space that surrounds the text on a page" , "Bound" , "Boundary line or the area" .)

I've seen this clue in The Irish News and The Globe and Mail.

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