Picture of old cold farm worker returning (6)

I believe the answer is:

fresco

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

'picture' is the definition.
(I know that Fresco is a type of mural)

'old cold farm worker returning' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'cold' becomes 'c' (eg on taps).
'farm worker' becomes 'serf' (serf is a kind of worker. I am not sure about the 'farm' bit.).
'returning' says the letters should be written backwards.
'o'+'c'+'serf'='ocserf'
'ocserf' backwards is 'FRESCO'.

'of' is the link.

Can you help me to learn more?

(Other definitions for fresco that I've seen before include "Painting using watercolours on plaster" , "Wall-painting" , "Mural painted on wet plaster" , "Painting style" , "Method of painting on walls" .)

I've seen this clue in The Telegraph.

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