Yellow stone, not dressed (5)

I believe the answer is:

straw

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'yellow' is the definition.
(thesaurus)

'stone not dressed' is the wordplay.
'stone' becomes 'st' (abbreviation).
'not dressed' becomes 'raw' (I am not sure about this - if you are sure you should believe this answer much more).
'st'+'raw'='STRAW'

Can you help me to learn more?

(Other definitions for straw that I've seen before include "Pale yellow colour" , "Dried stalks; yellow" , "Stalk - tube for drinking" , "Residue of threshed corn" , "Warts (anag.)" .)

I've seen this clue in The Times.

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