### Clue: Key metal work in dish (7)
### Answer: ESCALOP 
 ### Explanation: Definition: dish
 ESC(the "escape" key on your computer keyboard) + AL(chemical symbol for the element, aluminium) + OP(abbrev. for "opus", a musical or literary work).
Answer:  Not sure I can explain this, even after an online search.  An escalop is the shellfish also known as a scallop, and "scallop" (but not "escalop") also stands for its shell or a shell shaped dish used for cooking and serving seafood. Thus "escalop" = "dish" only indirectly.  On the other hand, if dish is mean to be course in a meal, it would have to be "escalope/scallop/a thin piece of meat fried with egg and breadcrumbs", or "escalop/scallop/a shellfish".  But can the latter be considered a dish without an accompanying description of how it's cooked?