Related Clues:

• Dropout
• Reversed-colours photo
• Backing musical? Feedback suggests thumbs down
• Pessimistic, gloomy
• Snap out of it? Yes - and no
• No overeating or going out to get drunk
• This required for development? No!
• Not positive it's found, for example, in an oyster
• Quite unlike the philosophy of Auguste Comte
• When collared by resident, say "no"
• Early form of photo as an illustration in original
• Expressing denial
• A shady image is certainly not positive!
• Not enthusiastic and optimistic, no
• Get a vine (anag.)