Sugar loaf? (10)
I believe the answer is:
sweetbread
'sugar loaf?' is the definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'sugar loaf?' is the wordplay.
'sugar' becomes 'sweet' (I am not sure about this - if you are sure you should believe this answer much more).
'loaf?' becomes 'bread' (loaf is a kind of bread).
'sweet'+'bread'='SWEETBREAD'
Can you help me to learn more?
(Other definitions for sweetbread that I've seen before include "Veal offal" , "Pancreas (as food)" , "Thymus gland as food" .)