He was the son of John McClean and Margaret McClean.
In 1901, McClean was living in house 7, Railway Place, Coleraine, Co. Londonderry. By 1911 the property was described as house 5, Railway Place, Coleraine, Co. Londonderry.
McClean joined Northern Bank in March 1916 at Castlewellan.
Whilst based in Castlewellan, McClean volunteered and enlisted into the Royal Flying Corps (RFC). His address at that time was Westbrook House, Coleraine.
McClean saw service with the British Expeditionary Force, the Defence of London, Ypres and Lens 1918. He was promoted to Lieutenant and then Captain. He received a gunshot wound when his ‘machine’ was shot down. Demobilisation came in June 1919. He was awarded the British Victory Medal and the British War Medal.
Following demobilisation, he resigned from the Bank on 18th July 1919.
McClean's Service Record indicates that he may have continued on in the RAF Reserves. His rank is shown as F/O (possibly Flying Officer) in 1923. In 1929 he relinquished his commission on completion of service.
The following information comes from the RAF Museum: