Starchy ingredient of Xmas pudding (4)
I believe the answer is:
Here is my best explanation:
'starchy ingredient' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'of xmas pudding' is the wordplay.
'of' indicates a hidden word.
'SPUD' is hidden in the letters of 'xmas pudding'.
Can you help me to learn more?