Related Clues:

• Across end of difficult plain
• Plain above head of Tiber
• Not hidden, open
• Hidden? With lid off, open to view
• Evident across mouth of Thames
• Clear some spare time
• Extra time open to view
• Open's finished -- amateur's fourth
• Patent finished before end of night
• Clear, blatant
• Completed on time? That’s clear
• Open secret, Conservative to quit
• Surplus time in public
• Plain retired vicar dipping into Holy Writ
• Blatantly obvious