At end of break setter's given mostly fried potato in Korean dish (6)

'korean dish' is the definition.
The definition suggests a singular noun which matches the answer.

'at end of break setter's given mostly fried potato' is the wordplay.
'at end of' says to put letters next to each other (some letters go at the end of others).
'break setter's given' becomes 'kim' (I can't justify this - if you can you should give a lot more credence to this answer).
'mostly' means to remove the last letter.
'fried potato' becomes 'chip' (I've seen this in other clues).
'chip' with its final letter removed is 'chi'.
'kim'+'chi' is 'KIMCHI'.

'in' is the link.

Can you help me to learn more?