Enthused, a couple of students sack party (3,5,2)
I believe the answer is:
all fired up
'enthused' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'a couple of students sack party' is the wordplay.
I cannot quite see how this works, but
'a' is found in the answer.
'students' could be 'll' (an abbreviation for learner driver written twice) and 'll' is found in the answer.
'sack' could be 'fire' (synonyms) and 'fire' is located in the answer.
'party' could be 'dup' (Democratic Unionist Party) and 'dup' is found within the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?