Possible Clues:

• Guardian, in the zoo say
• Person or guard in charge or animals or people
• Animal custodian; plain ring
• Cain asked ` `Am I my brother's ......?' '
• Holder; museum official
• Cain wasn't for Abel, or so he claimed
• Will the guard look up again?
• Is the guard about to look back?
• Come up and take another look at this in the zoo
• Custodian; bar across magnet