Drink produced within Hungary's borders is a remarkable thing (5)
I believe the answer is:
honey
'drink' is the definition.
(I know that honey is a type of syrup)
'within hungary's borders is a remarkable thing' is the wordplay.
'within' indicates putting letters inside.
'borders' says to hollow out the word (remove centre letters) (only the edge or border letters remain).
'is a remarkable thing' becomes 'one' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'hungary' with its middle removed is 'hy'.
'hy' placed around 'one' is 'HONEY'.
'produced' is the link.
Can you help me to learn more?
(Other definitions for honey that I've seen before include "Treasure" , "Produce of bees" , "Love" , "Sweet yellow liquid" , "Sweet term of endearment" .)