The most common and most likely answer to this crossword clue is the 9 letter word PLOUGHMAN
I've seen this crossword clue in The Sunday Telegraph
P
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O
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G
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More clues leading to the result PLOUGHMAN
Buddy explains!
The straight part
We know that "A dish for one whose work is groundbreaking?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a dish for one whose work is groundbreaking? = ploughman.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does PLOUGHMAN mean?
PLOUGHMAN noun- A man who plows land with a plough.