glic is a word from Gaelic Irish meaning clever1, cunning or wily2.
Usage Example:
1. In the musical equivalent of a penalty shoot out, Billy defeated his Clare opponent, as he proved a little more 'glic' on the fiddle during the winner takes all session, according to his proud father.3
In Irish:
1. An te nach mbionn laidir ni follair do bheith glic! = He who is not strong must needs be cunning!4
Sources:
1. http://www.wordgumbo.com/ie/cel/iri/irish.htm
2. http://www.hoganstand.com/general/identity/dictionary/w.htm
3. http://www.munster-express.ie/030905/news2.htm
4. http://www.gurdjieff-internet.com/article_details.php?ID=42&W=7