Related Clues:

• It's on your good side
• Reaction to a snub, maybe
• Bond, e.g
• The Hulk's catalyst
• Thing worth keeping
• Working factory, e.g.
• Intelligence provider, spy-wise
• Item in the black, e.g.
• It's on the plus side
• Cause of an outburst
• Red-seeing state
• Résumé skill, e.g.
• Valuable quality
• It may be liquid
• Brains, for example