Where cabbages grow, you'll see a path round (5)
I believe the answer is:
patch
'where cabbages grow you'll' is the definition.
The answer is a location as well as being a singular noun. This is suggested by the definition.
'see a path round' is the wordplay.
'see' becomes 'C' (the word for the letter, according to Chambers).
'round' indicates putting letters inside.
'c' going into 'path' is 'PATCH'.
Can you help me to learn more?
(Other definitions for patch that I've seen before include "Piece of land, of mending material" , "Repair; area" , "Piece of cloth as decoration or to cover a hole" , "Material used to cover a tear" , "bed" .)