Sandy,

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.

Eilis O'Hara