Clue: 24 stirred in Inca prepared for a different civilisation (10)
Answer: PHOENICIAN
Explanation: Definition: a different civilisation
A charade of PHOE, an anagram ('stirred') of HOPE (the answer to '24' down – as this is also a down light, the "down" is not mentioned) plus NICIAN, another anagram ('prepared') of 'in Inca'. 'Different' because it is not Inca.