Possible Clues:

• Fish stew
• British use a basil oil when cooking stew
• *Literally, 'boil and lower'
• Spicy fish stew from Provence
• Fish stew or soup
• Unexpectedly, a bus is liable to retain old cross-channel fare
• Be bilious, alas, stirring soup
• Fish stew from Provence
• Rich fish stew
• Use alibi a slob fishily concocted