Record American event (6)
I believe the answer is:
discus
'event' is the definition.
(athletics event)
'record american' is the wordplay.
'record' becomes 'disc' (eg a CD, compact disc).
'american' becomes 'US' (abbreviation for United States).
'disc'+'us'='DISCUS'
(Other definitions for discus that I've seen before include "Circular projectile" , "flat missile" , "Athletics field event" , "Field event projectile" , "Item thrown in sport" .)