Crossword Genius

Tendency not to move when snakes are in it (7)

Ross

I believe the answer is:

inertia

I'm a little stuck... Click here to teach me more about this clue!

'tendency' is the definition.
The answer and definition can be both human attributes as well as being singular nouns.
Maybe you can see a link between them that I can't see?

'not to move when snakes are in it' is the wordplay.
'are in it' can be anagrammed to 'INERTIA'.
However, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for inertia that I've seen before include "Tendency to inactivity" , "Disposition to do nothing" , "lack of action" , "inclination not to budge" , "I retain (anag) - the tendency to retain same speed and direction" .)

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