Spooner's erroneous practice shot in Greenwich or Berlin? (10)
I believe the answer is:
songwriter
'berlin?' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'spooner's erroneous practice shot in greenwich' is the wordplay.
I cannot quite understand how this works, but
'practice' could be 'rite' (rite is a kind of practice) and 'rite' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
'or' acts as a link.
Can you help me to learn more?
(Other definitions for songwriter that I've seen before include "Producer of music/lyrics" , "Composer" , "Berlin, perhaps" , "One who works with numbers" .)