Snack on small ice cream (5)
I believe the answer is:
scone
'snack' is the definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'on small ice cream' is the wordplay.
'on' says to put letters next to each other.
'small' becomes 's' (abbreviation - e.g. clothes size).
'ice cream' becomes 'cone' (cone can refer to an ice cream cone).
's' next to 'cone' is 'SCONE'.
Can you help me to learn more?
(Other definitions for scone that I've seen before include "in which a stone was once found?" , "Plain teatime cake" , "Savoury cake" , "Plain cake (for Scottish kings?)" , "A little cake" .)