Possible Clues:

• Absent-mindedly unaware
• Unaware of old lawyer getting four letters of credit
• Not heeding more than fifty plugs right under one's nose
• Unaware, left island blocking patent
• Aztec Camera single that reached the top twenty in 1983
• Unaware first pair of lions occupies plain
• When clear outside, start to lift one blind
• Unheeding
• Ignorant learner and I in clear
• About fifty, one is plain absent-minded