Diana leaves gap in policy (6)

I believe the answer is:

stance

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'policy' is the definition.
(I've seen this in other clues)

I don't understand the rest of the clue.

(Other definitions for stance that I've seen before include "Attitude on the tee?" , "Attitude - taken by a golfer?" , "Posture; point of view" , "Position, viewpoint" , "Posture; viewpoint" .)

I've seen this clue in The Sun.

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