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Very good marks, for example, in test (5)

Ross

I believe the answer is:

assay

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'test' is the definition.
(I know that assay is a type of test)

'very good marks for example' is the wordplay.
'very good marks' becomes 'as' (I can't explain this - if you can you should give a lot more credence to this answer).
'for example' becomes 'say' ('say' can be used to introduce an example).
'as'+'say'='ASSAY'

'in' is the link.

Can you help me to learn more?

(Other definitions for assay that I've seen before include "Analyse to find the properties" , "Trial" , "Test gold" , "Test ore for content" , "Test the purity of metals" .)

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