Related Clues:

• Fine, delicate or hardly noticeable
• Slight and difficult to analyse, as distinction may be
• Slight and difficult to detect, like some humour
• Bustle about, being slight and difficult to analyse
• Bustle about being delicate
• Ingenious, difficult to analyse
• 'Elusive, delicate (6)'
• 'Fine, elusive (6)'
• Delicate, difficult to describe
• Very fine, difficult to perceive or appreciate
• It's not so simple to have bust the French like this
• Under the top of this, let there be no simple confusion
• Not so simple to have sublet this
• Let it be under the overturned bus in no simple fashion
• The omnibus has overturned, so let it be broken in no obvious way