Possible Clues:

• Mars
• Mars this
• Mars, with 'the'
• 'One mars this (3,6)'
• Mars employee's start in factory, succeeding Ruby, say
• Mars is colourfully known as the . . . . . . . . .
• Mars this place just a shade
• This mars the start of 8 down
• Informal name for Mars
• Mars if it's this