Crossword Genius

Sloth in tree mostly climbing with another likewise (7)

Ross

I believe the answer is:

inertia

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'sloth' is the definition.
(inertia can mean laziness or sloth)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for inertia that I've seen before include "Tendency to inaction" , "Stillness" , "Resistance to movement" , "Motion (if any) when no external force is applied" , "Disinclination to change" .)

I've seen this clue in The Times.
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