Happened to get an Oscar for just one scene! (5)
I believe the answer is:
cameo
'just one scene' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'happened to get an oscar' is the wordplay.
'happened' becomes 'came' (to happen upon and to come upon mean to encounter).
'to get' says to put letters next to each other.
'an oscar' becomes 'O' (phonetic alphabet: alpha, bravo, charlie etc.).
'came'+'o'='CAMEO'
'for' is the link.
Can you help me to learn more?
(Other definitions for cameo that I've seen before include "Famous actor's small role" , "Carving in relief, on a brooch say" , "E. Med. nation" , "Star's tiny role" , "Short performance" .)