Gala perhaps that's big in New York? (5)
I believe the answer is:
apple
'big in new york?' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for apple that I've seen before include "Pipped fruit" , "Empire?" , "Pomaceous fruit" , "Fruit with pips" , "Fruit from Eden?" .)