Stuart OK? Been upset for old movie comedian? (6,6)
'old movie comedian?' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'stuart ok? been upset' is the wordplay.
'upset' is an anagram indicator.
'stuartokbeen' is an anagram of 'BUSTER KEATON'.
'for' is the link.
Can you help me to learn more?
(Other definitions for buster keaton that I've seen before include "Broken statue (anag) - early film star", "Silent screen star", "Silent film comedy star, d. 1966", "US actor/director", "Comic".)