Related Clues:

• Metaphor for density
• This fish, blue when cooked, could be undesirable
• Fish sometimes used to make dashi
• A diner's stewed fish
• Item in a tight tin
• Fish typically preserved in olive oil
• Fish name derived from an Italian island
• Salad and radicchio for starters, then eat fish
• Small oily fish
• A doctor turning up in function's not much of a catch
• Emperor having no time to eat fish
• South African right to eat fish
• Rider of a packed subway, metaphorically
• Small marine food fish
• Ridiculous, as diners get packed in like this