Related Clues:

• First-grade mountain, hard ascent at first
• Generation after Z
• A triumphant cry on clinching record
• First Letter to the Corinthians?
• A Greek letter?
• A as in Agamemnon
• — Male; — particle
• Greek letter (definitely not the last one)
• Tending to dominate
• A for Aristotle
• Leading Greek character in final phase
• Nato make it a part of final phase
• Greek character, railman, regularly skirts public house
• Nato uses it as a contribution to vital phase
• First-class kind of brainwave