Possible Clues:

• Mad pilot? (anag)
• Perhaps consul’s not finished off certificate
• Evidence of education
• Proof one's passed hummus, say, all of meal regularly put away
• What might confer a degree of tact when cutting cold Yankee
• Proof of qualification
• Go down and see graduate getting certificate
• Exam certificate
• Academic paper produced by nerds from Promised Land?
• ''Sheepskin'' certificate