Irish love Greek character from top-class, ground-breaking comic story (7,5)
I believe the answer is:
graphic novel
'ground-breaking comic story' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'irish love greek character from top-class' is the wordplay.
I cannot really see how this works, but
an anagram of 'love' is 'ovel' which is within the answer.
'greek' could be 'gr' (abbreviation for Greek) and 'gr' is found in the answer.
'character' could be 'phi' (phi is a kind of letter of the alphabet) and 'phi' is present in the answer.
'top class' could be 'a' (top grade) and 'a' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for graphic novel that I've seen is " Book with a comic strip format".)