Possible Clues:

• Joke
• Zinger
• Flippant remark
• Smart remark
• Witticism
• Sarcastic remark
• Make a witty comment, or a phonetic hint to what the indicated letters do (Bonus: Note what these letters spell)
• Having joined one liner, I sack crew in reorganisation
• Is city covered in seaweed? That's a joke
• Dig a brief period of time amongst seaweed