Organist somehow dressing down (8)

I believe the answer is:

roasting

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'dressing down' is the definition.
'roasting' can be an answer for 'dressing' (thesaurus). I'm not sure about the 'down' bit.

'organist somehow' is the wordplay.
'somehow' indicates anagramming the letters.
'organist' anagrammed gives 'ROASTING'.

Can you help me to learn more?

(Other definitions for roasting that I've seen before include "Severe reprimand (inf)" , "Organist (anag)" , "Criticising" , "Heating" , "Cooking in fat" .)

I've seen this clue in The Telegraph.

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