Griffiths Valuation which was done in Co. Clare in 1855 has the following entires for James Leyden by Townland, Civil Parish and Poor Law Union.
Leyden James Clonroad Beg: Ennis Town: Church St Drumcliff Ennis
Leyden James Kilfenora Kilfenora Ennistimon
Leyden James Kilfenora: Kilfenora: Main St Kilfenora Ennistimon
Griffiths was a list prepared for tax purposes of those renting or owning property in Co. Clare during that year. I'm assuming James Leyden remained in the county and didn't move elsewhere.