Crossword Genius

Rosie's upset over us being earnest (7)

Ross

I believe the answer is:

serious

'earnest' is the definition.
(similar in meaning)

'rosie's upset over us' is the wordplay.
'upset' indicates an anagram.
'over' is a charade indicator (letters next to each other) (in a down clue, some letters go over others).
'rosie' anagrammed gives 'serio'.
'serio'+'us'='SERIOUS'

'being' acts as a link.

(Other definitions for serious that I've seen before include "Not light or frivolous" , "Important - solemn" , "Earnest - important" , "Stern" , "Important -- grave" .)

I've seen this clue in the Evening Standard.
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