He helped form a branch of the Gaelic League at college and persuaded his friends, including Joyce, to take lessons in Irish.
After the 1916 Easter Rising he was arrested and imprisoned in Cork, but after a hunger strike was released before he came to trial.
On the night of 6 March 1921 three Auxiliaries from the Royal Irish Constabulary (RIC) came to his house and one of them shot him, injuring him fatally.
[6] One of his killers was later said to be George Nathan who died fighting for the Republicans in the Spanish Civil War.
[9] His brother Patrick Clancy was a Labour Party Teachta Dála (TD) for Limerick from 1923 to 1932.