Crossword Genius

Paint (not on paper) like an artist? (15)

Ross

I believe the answer is:

temperamentally

I'm a little stuck... Click here to teach me more about this clue!

'paint not on paper like an artist?' is the definition.
I can't judge whether this defines the answer.

'paint not on paper like' is the wordplay.
'paint' becomes 'tempera' (type of paint).
'not on paper' becomes 'mental' (I can't justify this - if you can you should give a lot more credence to this answer).
'like' becomes 'ly' (similar in meaning).
'tempera'+'mental'+'ly'='TEMPERAMENTALLY'

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I've seen this clue in The Times and The Sunday Times.
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