Very cheap beside nonentity (4,2,7)
I believe the answer is:
next to nothing
'very cheap' is the definition.
I can't tell whether this defines the answer.
'beside nonentity' is the wordplay.
'beside' becomes 'next to' (I've seen this in another clue).
'nonentity' becomes 'nothing' (I can't explain this - if you can you should believe this answer much more).
'nextto'+'nothing'='NEXT TO NOTHING'
Can you help me to learn more?
(Other definitions for next to nothing that I've seen before include "utterly unimportant", "Lacking neighbours", "Very little", "Not much".)