Possible Clues:

• Pa's got nil in back there
• Plains (anag.)
• 'This is -- Tap', 1984 film about a British heavy metal group on tour in America
• Relating to a certain column
• Of a certain column
• Word before cord or column
• & 1 Down ... wheel them around wedding venue's back passage?
• Drinks up, carrying home type of tap?
• Lapsing somehow not good -- backbone's needed
• __ fluid