1. target or goal.   Hint First letter clue   2. small opening of cavity.   First letter clue   3. partly lighted shadow.   First letter clue   4. unit for measuring light energy.   First letter clue   5. stitching of parts at their edges; thread or wire.   First letter clue   6. thick-skinned animal (or person).   First letter clue   7. substance which provides nourishment.   First letter clue