### Clue: Stagnant lake to swell river in movie (4,4)
### Answer: DEAD CALM 
 ### Explanation: Definition: movie
  DEAD(stagnant,unmoving) + [L($$l$$ake) **contained in**(to swell) CAM(the river in Cambridgeshire, flowing through – no surpise – Cambridge)]
Defn: Movie starring Sam Neill, Nicole Kidman and Billy Zane