World's Fastest Steam Locomotive or a Type of Duck
This page is the CodyCross answer for the clue below from London, Group 499, Puzzle 3 (West End Theatre).
Question is: World's Fastest Steam Locomotive or a Type of Duck
and the answer is: MALLARD
Word Meaning:
MALLARD — (countable) Anas platyrhynchos, a common and widespread dabbling duck, natively found throughout the Northern Hemisphere, whose male has a distinctive dark green head.
Definitions from Wiktionary.