As you're no doubt aware, Clare records are hard to find!
www.rootsireland.ie/ only has birth/baptism records for Clare - no marriages. The only John McInerney with parents Michael & Bridget (Not McNamara) is 1846 & not in Ennis
I couldnt find any McInerneys in the early Irish Censuses (free) in Clare
In the Tithe Applotments (free at titheapplotmentbooks.nationalarchives.ie/ - google if link doesn't work) there are 63 McInerneys in Clare including 12 Michaels (or abbreviations of Michael) from 1825 to 1833 in various parishes. i checked each to see if any was in Ennis but no luck!
Last suggestion is to try (if you haven't already) the nli R C registers (free at registers.nli.ie/); enter Ennis in the parish search and trawl through the marraiges & baptisms which come up.