Clue: Indigenous person, putting head down among tribe, starts to show superb ingenuity (12)
Answer: CREATIVENESS
Explanation: Definition: ngenuity
An envelope ('among') of ATIVEN, formed from NATIVE ('indigenous person') with the N moved to the end ('putting head down') in CREE (First Nation 'tribe' in Canada and USA) plus S S ('starts to **S**how **S**uperb').