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Diplomacy protects royal leader returning with impetus (8)

Ross

I believe the answer is:

traction

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(Other definitions for traction that I've seen before include "The action of drawing or pulling over a road or track" , "Continuous pull on limb in medical treatment" , "Gripping power to permit movement" , "Use of weights and pulleys to heal a fracture" , "Which leaves on the line will affect" .)

I've seen this clue in The Hindu.
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