Crossword Genius

Praising a quarter of European supply systems? Not entirely (10)

Ross

I believe the answer is:

eulogistic

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'praising' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for eulogistic that I've seen before include "Praising" , "expressing lavish praise" .)

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