Crossword Genius

Children, one vital force (3)

Ross

I believe the answer is:

chi

'vital force' is the definition.
(life force in Chinese philosophy)

'children one' is the wordplay.
'children' becomes 'ch' (genealogical abbreviation).
'one' becomes 'i' (Roman numeral).
'ch'+'i'='CHI'

(Other definitions for chi that I've seen before include "Classical character" , "The 22nd letter of Greek alphabet" , "Twenty-second Greek letter" , "Greek letter; force in Chinese philosophy" , "Greek letter; Chinese life force" .)

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