### Clue: Absolute idiot on top of Ned Flanders's place (7)
### Answer: ANTWERP 
 ### Explanation: Definition: Flanders's place
 A(absolute;perfect;ideal) + [ TWERP(an idiot) **placed after**(on, in an across clue) **the 1st letter of**(top of) "Ned". I'm not totally sure of A being a synonym for "absolute". I've considered two other explanations: one with "on" as an unsatisfactory containment indicator, and another with "a" as an abbreviation that I can't find in the references I have.
Defn: …, specifically a port in Flanders, the northern region of Belgium.