Ore analysts like Dorothy? (8)

I believe the answer is:

assayers

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

'ore analysts' is the definition.
'assayers' can be an answer for 'analysts' (I've seen this in another clue). I am not sure about the 'ore' bit.

'like dorothy?' is the wordplay.
'like' becomes 'as'.
'dorothy?' becomes 'sayers' (I can't justify this - if you can you should believe this answer much more).
'as'+'sayers'='ASSAYERS'

Can you help me to learn more?

(Other definitions for assayers that I've seen before include "They appraise metals" , "they test for quality" .)

I've seen this clue in the Sydney Morning Herald.

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