Related Clues:
- Bad forecast for sailboaters
- Problem for a sloop
- Composed some classical music
- Endlessly observe Magritte being calm?
- Storm preceder, idiomatically
- Sneer upset English still
- Shows derision, in a way
- Controlled line in river
- Spotted grebe's close circling river unruffled
- Inner peace, incorporated in the four longest Across answers
- Take some pharmacological Mickey Finn and relax
- Very calm
- Unlikely to blow a gasket
- Without any wind
- Far from turbulent