Iconic fossil of the Jurassic (8)

Unbeatable foe: ruin (7)

The modern Persian language (5)

Dickens novel (1855-57) (6,6)

German POW camp of WWII (6)

Andre ------, eight-time tennis Grand Slam winner (6)

Say something that is then contradicted by untimely events (5,3,4)

Mature, prosper (5)

Sets of nine items (7)

Place where secret messages, etc, may be left (4,4)

The ----, English wetland area abutting The Wash (4)

Naive or unreasonably optimistic character, after Voltaire's Candide pedant (8)

Celestial body (5)

Jewish outpost besieged by Romans in 72 AD (6)

In a strong position (2,4,6)

Completely wrecked; devastated (2,5)

---- Thorvaldsson, 10th century explorer, the first European to settle in Iceland (4)

Sarcastic oxymoron meaning difficult or impossible to understand (2,5,2,3)

Greek god of wine, fertility and drama (8)

Classical jar for storing liquids (7)

Eldest of the three Gorgon sisters (6)

Not perfectly round (5)

In the same place (used when citing a reference) (4)