Some forgot a topper, upsetting King Edward? (6)
I believe the answer is:
potato
'king edward?' is the definition.
The definition suggests a singular noun which matches the answer.
'some forgot a topper upsetting' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'upsetting' shows that the letters should be reversed in order.
'otatop' is hidden in the letters of 'forgot a topper'.
'otatop' written backwards gives 'POTATO'.
Can you help me to learn more?
(Other definitions for potato that I've seen before include "Tuber, popular in Ireland" , "The staple food is strangely too apt" , "Common vegetable" , "Vegetable with eyes" , "Root crop" .)