English landscape gardener known north of the border (4)
I believe the answer is:
kent
'english landscape gardener' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'known north of the border' is the wordplay.
'known north of' becomes 'ken' (I am not sure about this - if you are sure you should believe this answer much more).
'border' indicates taking the first letters.
The first letter of 'the' is 't'.
'ken'+'t'='KENT'
Can you help me to learn more?
(Other definitions for kent that I've seen before include "Earl Lear banishes" , "Southern English county" , "South-eastern county" , "Lear's faithful Earl" , "Part of 1 25 [KING LEAR]" .)