American leaves a field event with a record (4)
I believe the answer is:
disc
'a record' is the definition.
('disc' can be a synonym of 'record')
'american leaves a field event' is the wordplay.
'american' becomes 'us'.
'leaves' suggests deleting specific letters.
'a field event' becomes 'discus' (discus is a kind of field event).
'discus' with 'us' taken out is 'DISC'.
'with' is the link.
(Other definitions for disc that I've seen before include "Record, CD" , "Thin flat circular object" , "One of 33, 45 or 78?" , "Flat thin circular body" , "Gramophone record" .)