There's more than one in a round (5)
I believe the answer is:
scone
'a round' is the definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'there's more than one' is the wordplay.
'there's' is a charade indicator (letters next to each other).
'more than' becomes 'sc' (I can't explain this - if you can you should give a lot more credence to this answer).
'sc' put next to 'one' is 'SCONE'.
'in' is the link.
Can you help me to learn more?
(Other definitions for scone that I've seen before include "Griddle-cake" , "Savoury cake" , "Product of baker" , "Perth's settlement" , "in which a stone was once found?" .)