SANTA MONICA, CAThe theatrical career of recent USC School of Cinema-Television graduate Neil Hemmitt was put on hold indefinitely as the aspiring director went straight to video-store clerking Monday. 'The big studios never gave me a chance,' Hemmitt said, as he shelved a Big Fish DVD at Blockbuster. 'But it's because they didn't understand me.' Hemmitt's producers, Harold and Francine Hemmitt, pulled his financial support in March, after calling his predicament 'hardly original.' 