Crossword Genius

Stuart OK? Been upset for old movie comedian? (6,6)

Ross

I believe the answer is:

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'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.
'stuart'+'ok'+'been'='stuartokbeen'
'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".)

I've seen this clue in Sydney Morning Herald.