Crossword Genius

Baltic supplier seen in moderation (4)

Ross

I believe the answer is:

oder

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'baltic supplier' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'in moderation' is the wordplay.
'in' indicates a hidden word.
'ODER' is hidden within 'moderation'.

'seen' is the link.

Can you help me to learn more?

(Other definitions for oder that I've seen before include "European flower" , "East European river" , "Rode around the European river" , "School blazer insignia" , "River that, with the Neisse, forms the German-Polish border" .)

I've seen this clue in The Times.
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