Artist going over silhouette of Sneezy and Grumpy (4)

I believe the answer is:

arsy

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'sneezy and grumpy' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'artist going over silhouette' is the wordplay.
'artist' becomes 'RA' (Royal Academician, member of Royal Academy of Arts).
'going over' says the letters should be written backwards.
'silhouette' becomes 'sy' (I can't explain this - if you can you should believe this answer much more).
'ra' reversed gives 'ar'.
'ar'+'sy'='ARSY'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for arsy that I've seen before include "argumentative" , "lucky down under" .)

I've seen this clue in The Independent.

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