Possibly a dish for Long John's sports venue? (7,5)
I believe the answer is:
bowling alley
'sports venue?' is the definition.
(bowling is a sport)
'possibly a dish for long john's' is the wordplay.
I cannot really see how this works, but
'a' is present in the answer.
'dish' could be 'bowl' (bowl is a kind of dish) and 'bowl' is located in the answer.
'long' could be 'l' and 'l' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for bowling alley that I've seen before include "Where to play skittles" , "Where to find rolling pins" , "entertainment hall" .)