Crossword Genius

One trades in ethical concepts (6)

Ross

I believe the answer is:

ideals

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

'ethical concepts' is the definition.
The definition and answer can be both related to thinking as well as being plural nouns.
Maybe you can see a link between them that I can't see?

'one trades' is the wordplay.
'one' becomes 'i' (Roman numeral).
'trades' becomes 'deals' ('deal' can be a synonym of 'trade').
'i'+'deals'='IDEALS'

'in' is the link.

Can you help me to learn more?

(Other definitions for ideals that I've seen before include "Standards of excellence" , "Models of excellence" , "Moral standards" , "Moral value" , "'Perfect models, highest notions (6)'" .)

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