Top moves in close field event (4,3)
I believe the answer is:
shot put
'field event' is the definition.
(shot put is a kind of field event)
'top moves in close' is the wordplay.
'moves' is an anagram indicator.
'in' is an insertion indicator.
'close' becomes 'shut' ('shut' can be a synonym of 'close').
'top' with letters rearranged gives 'otp'.
'otp' inserted within 'shut' is 'SHOT-PUT'.
(Other definitions for shot put that I've seen before include "Throwing event" , "Athletic field event" , "Field event in athletics" , "Competition in which a heavy metal ball is hurled" , "Throwing contest" .)