The term 'Islamic Leader, One Way' can be solved by the four-letter word 'Amir'. An Amir is a leader or ruler in Islamic countries. It is derived from the Arabic word 'amir', which means commander or prince. The title is used to refer to leaders of various sizes, from local tribal chiefs to the rulers of large empires. Historically, an Amir was a military leader who had the authority to command an army. In modern times, the title is often used to refer to political leaders, such as the Prime Minister of a country.