Left makeshift children's hut, strangely unimpeded, with pretend cake (3,3)
I believe the answer is:
mud pie
'left' is the definition.
Both the answer and definition are singular nouns.
Perhaps there's a link between them I don't understand?
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for mud pie that I've seen before include "child might play with this" , "Child's earthy mess" , "Chocolate and coffee mousse on pastry base (US) - insult hurled (at someone)" .)