Related Clues:

• Place to wash up
• Dismount
• Go into depth?
• Drop to the bottom
• Kitchen basin
• Invest, so to speak
• Reduce one's altitude
• Derive (from)
• Drop, as a testicle
• Be more dense than water, say
• Where dirty dishes pile up
• Lose altitude
• Rappel down
• Make a putt
• Become clear, with "in"