Possible Clues:

• Mischievous wife rubbished his claim
• Capricious canon turned up, embracing a chap thus?
• Delicately playful
• Fanciful act overturned, protecting particular chap thus
• Mischievous, tailless cat, not accepted in stage show
• Capricious leaders of Wyndham's hail iconic non-U musical
• Appealingly amusing
• Capricious wife greeting Hamilton, say, out of uniform
• We initially welcome song and dance performance without uniform that's quaint
• It's fanciful to work with hothead on Islamic adaptation