In it are makings of passivity (7)

I believe the answer is:

inertia

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'passivity' is the definition.
(lack of movement)

'in it are makings' is the wordplay.
'in it are' can be anagrammed to 'INERTIA'.
But, I'm not sure how this is indicated.

'of' is the link.

Can you help me to learn more?

(Other definitions for inertia that I've seen before include "Way of selling" , "Slowness to react" , "Listlessness" , "I retain, being without energy" , "'Sluggishness, indolence (7)'" .)

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

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