In Clannad's "White Fool" (lyrics at http://www.celticlyricscorner.net/clannad/white.htm), both Irish verses shown on this site have:
"daoine corr an t'saoil [sic] ag góid [sic] leo", which means the corrupt people of the world keep on stealing.
Actually, the second Irish verse is
"daoine corr an tsaoil ag troid leo",
which means the corrupt people of the world keep on fighting. A subtle variation, but in the album booklet that's what they've printed, and that's also what I hear.
Also, "an tsaoil" is the correct spelling for "of the world" (no apostrophe after the t), and there is no fada (accent) on "goid".
Bhí'os acu ___
Ar a t séan dóigh ___
I actually think this is supposed to be
"Bhí a fhios acu ar an tsean-dóigh"
Perhaps a better Irish speaker can explain, but what I hear/read here is "They knew the old ways".
Sean (rhymes with "man" and means old) has no fada, whereas séan (pronounced like Shane, and means omen or good luck). The correct word is "sean".
Éist leo means "Listen to them"
This song is rather dear to me, as it is the first Irish I ever heard, and it inspired me to study this amazing language, which I've been doing for about 23 years now.