### Clue: Sit one Oxbridge staffer in capsized ship (8)
### Answer: POSEIDON 
 ### Explanation: Definition: capsized ship
 POSE(to sit for, say, an artist) + I(Roman numeral for "one") + DON(one of the lecturing staff at the colleges in Oxbridge).
Defn: … in the action-adventure disaster film, The Poseidon Adventure, and its sequel.