Possible Clues:

• Make the world a better place
• Be charitable
• Be altruistic
• Have a positive impact
• Give to charity, say
• The start of 1 across might do nothing back here, yet do it (2, 4)
• Be a benefactor
• For Fido to get around and do it up will be of benefit
• Give to charity, e.g
• Contribute to society