Crossword Genius

Tie with Iran may bring apathy (7)

Ross

I believe the answer is:

inertia

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'apathy' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

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(Other definitions for inertia that I've seen before include "Passiveness" , "Lack of inclination to move" , "Sort of reel" , "Way of selling" , "Display laziness" .)

I've seen this clue in The Sun.
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