Related Clues:

• 'Above my pay grade' ... and, read in four parts, a hint to 16-, 24-, 32-, 40- and 49-Across
• ''Ask someone else''
• 'Impossible for me!'
• 'That's beyond me'
• 'Sorry, made other plans'
• 'Too frustrating for me!'
• I am unable to get even mains in new condo
• Wish I could help by coming up with old forensic evidence on fleece
• 'Impossible for me'
• I am unable to perform (that)
• 'Sorry, pal'
• "It's impossible!"
• Bottle party?
• "Sorry, have plans"
• "There are no words"