Crossword Genius

Correlation or arrangement of a trio (5)

Ross

I believe the answer is:

ratio

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

'arrangement of a trio' is the wordplay.
'arrangement of' indicates anagramming the letters.
'a'+'trio'='atrio'
'atrio' is an anagram of 'RATIO'.

'or' acts as a link.

(Other definitions for ratio that I've seen before include "Proportion between two numbers" , "Mathematical relation of one thing to another" , "Relationship found in a riot" , "Proportional relationship" , "Mathematical relationship" .)

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