My nearest McLean relative is:

McLean, Teresa Victoria Islay (1846 - 1882) - female
b. 1846
d. 8 APR 1882 in Clarence, Tas.
spouse: Blyth, Edward Pearson (1840 - 1939)
- m. 16 JUL 1872 in Home Of Mrs McLean, New Town, Tas.
----------child: Blyth, Harriet Agnes Theresa (1873 - 1875)
----------child: Blyth, Pearson McLean (1875 - 1968)
----------child: Blyth, Florence Annette (Net) (1877 - )
----------child: Blyth, Margaret Malvina (Malvina) (1879 - )
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You will find more about the McLeans and Blyth family on my webpage, http://www.tassie.net.au/~rteirney/

but another excellent strategy is to go to the First Families site (from my links page) and then Search for McLean. You will then throw up results of other Australian McLean researchers which connects with their Irish roots.