Related Clues:

• Charlie follower
• Duke terribly late finds river mouth
• Greek letter turns up in upbeat ledger
• English officer opening US lawman’s letter
• Buildup at the mouth of a river
• River estuary
• Letter of thanks after getting shown the way up
• Letter to Greek daughters terribly late
• Heartlessly delivered a letter from Thessaloniki
• Greek character was first to turn up with word of gratitude
• Greek character dealt out
• Branched river mouth
• Fourth in order took first place, backed by cheers
• River mouth, like that of the Nile
• Greek letter folded over in flat ledger