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Old agricultural worker upsets Charlie starting oil painting (6)

Ross

I believe the answer is:

fresco

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'painting' is the definition.
(fresco is a kind of painting)

'old agricultural worker upsets charlie starting oil' is the wordplay.
'old agricultural worker' becomes 'serf' (I can't justify this - if you can you should give a lot more credence to this answer).
'upsets' is a reversal indicator.
'charlie' becomes 'c' (phonetic alphabet: alpha, bravo, charlie etc.).
'starting' says to take the initial letters.
The first letter of 'oil' is 'o'.
'serf' backwards is 'fres'.
'fres'+'c'+'o'='FRESCO'

Can you help me to learn more?

(Other definitions for fresco that I've seen before include "Mode of wall painting" , "Painting style" , "Mural painted on a wall" , "Forces (anag) - wall painting" , "Method of painting on walls" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).
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