The new stadium designed for West Ham United, perhaps? (7)
I believe the answer is:
anagram
'the new stadium' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for anagram that I've seen before include "type of clue" , "Hedonism for Sondheim" , "reordering" , "Word that rearranges another's letters" , "Word arranged from the letters of another" .)