Possible Clues:

• Pun
• Regular feature of crossword clues — droops wanly (anag)
• Pun, e.g
• Pun from Poland so wry, funny
• Witty device
• What a pun is
• Pro lays down, droops wanly, repeatedly undone by this aspect of waggish writing
• Exploit argument that may be intended humorously
• Crossword clue feature, often