Crossword Genius

Prerequisite for walking evident in non-verbal ancestors (7)

Ross

I believe the answer is:

balance

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

'prerequisite for walking' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'in non-verbal ancestors' is the wordplay.
'in' says the answer is hidden in the clue.
'BALANCE' can be found hidden inside 'non verbal ancestors'.

'evident' acts as a link.

Can you help me to learn more?

(Other definitions for balance that I've seen before include "Equipoise" , "emotional stability" , "Rest" , "Sign" , "Scale for weighing" .)

I've seen this clue in The Independent.
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