After a thousand goes, clumsy person produces skating jump (4)
I believe the answer is:
lutz
'skating jump' is the definition.
(I've seen this in another clue)
I don't understand the remainder of the clue.
(Other definitions for lutz that I've seen before include "Jump from one 5 down to the other" , "Figure skating jump with turns" , "difficult skating manoeuvre?" , "Figure skating movement" .)