Related Clues:

• Talk of inability!
• Des will not be able to sound high enough for this (4)
• Lack the ability to perhaps get around to make a bit of poetry
• One is not able to produce anything so insincere
• 10 across, in short, is 7 down
• It would be insincere to begin 24 down this way
• Lack the ability to follow Des in song
• Unable to be genuine, by the sound of it
• Insincere talk of inability
• Up the artist got with the jar gone, by the sound of it
• One really isn't able to be so insincere
• Not able to be unbelievable
• Not able and not sincere
• An inclination to inability
• Unable to be so insincere