Originally Posted by
Xilurm
Judgind by how Clive looks during his fight against the Dragoon, which I assume the same time as the Pheonix vs Ifrit fight, then that's before the timeskip.
Also the description for Clive on the website says this. I'll put the important part in spoilers because it does seem kinda spoilery tbh.
The firstborn son of the Archduke of Rosaria. Though all expected him to inherit the Phoenix's flames and awaken as its Dominant, destiny instead chose his younger brother Joshua to bear this burden. In search of a role of his own, Clive dedicated himself to mastering the blade. His practice pays off when, at just fifteen years of age, he wins the ducal tournament and is dubbed the First Shield of Rosaria—tasked to guard the Phoenix and blessed with the ability to wield a part of his fire. Alas, Clive's promising career is to end in tragedy at the hands of a mysterious dark Eikon, Ifrit, setting him on a dangerous road to revenge.
Based on that last sentence I don't think Joshua survives.