Japan's Nikkei slips to 1-week low, exporters hurt by firmer yen

* Renesas untraded on glut of buy orders, govt mulls rescue * Defensives in demand, global growth still a concern By Dominic Lau TOKYO, Sept 24 (Reuters) - The Nikkei share average fell to a one-week low on Monday, as a firmer yen added to woes for automakers and other exporters, which have been under pressure due to the territorial dispute between Japan and China. Concerns about global growth weighed on the market even though major central banks have launched stimulus measures