Seir Kieran caters mainly to players of the games of hurling and camogie. However, the club has also competed in the Offaly football competitions and reached the Offaly Senior Football Semi-final in 1927.[4] Founded in 1887, for 67 of its 128 years, and continuously since 1970, the club has competed in the Offaly Senior Hurling Championship,[5] winning the Sean Robbins Cup on four occasions. Seir Kieran has also had success at junior, intermediate, and under-age levels, for example, winning the Offaly Junior 'A' Hurling Championship for the seventh time in 2014.
Players from Seir Kieran were on each of the four Offaly teams that have won the Liam MacCarthy Cup, and eleven hurling All Star Awards have been won by five players from Seir Kieran: Eugene Coughlan (1984, 1985); Johnny Dooley (1994, 1995, 2000); Kevin Kinahan (1994, 1995, 1998); Billy Dooley (1994, 1995); and Joe Dooley (1998).[6] Three players from the club have captained the Offaly Senior hurling team – Joe Dooley (1997), Johnny Dooley (2000), and Joe Bergin (2014). Two Clareen players have captained Offaly teams that reached All Ireland Junior Hurling Finals – Jimmy Corrigan (1915), and P.J. Grogan (1929). Joe Dooley managed the Offaly Senior hurlers from 2008 to 2011.