Leave a league after lower score at rugby (4,4)
I believe the answer is:
drop goal
'score at rugby' is the definition.
'drop goal' can be an answer for 'score' (I've seen this before). I'm not sure about the 'at rugby' bit.
'leave a league after lower' is the wordplay.
I cannot really understand how this works, but
'leave' could be 'go' (to go is to depart or leave) and 'go' is found within the answer.
'a' is present in the answer.
'league' could be 'l' (abbreviation) and 'l' is found in the answer.
'lower' could be 'drop' (I've seen this before) and 'drop' is found in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for drop goal that I've seen before include "one scores with over the bar" , "score points?" , "One way of scoring at rugby" .)