Possible Clues:

• What you need to understand this puzzle's theme?
• Spooner's impudence therefore showing sound judgement
• Wit's sneer's so upsetting — the fellow admits that
• Ninny's lack
• Prudent judgment
• Intelligent type going around the Curragh gets a piece of Arabian's mind perhaps?
• What's 'common' with beastly connotation?
• Instinctive shrewdness
• One of The Powers with brains gets a piece of Arabian's mind perhaps?
• 'Common' Arabs maybe seen wandering about