Crossword Genius

A trio's awful relationship (5)

Ross

I believe the answer is:

ratio

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

'a trio's awful' is the wordplay.
'awful' indicates an anagram.
'a'+'trio'='atrio'
'atrio' anagrammed gives 'RATIO'.

(Other definitions for ratio that I've seen before include "Proportion, relation" , "Relation between two amounts" , "9 to 5, say?" , "E.g. two to one" , "Relationship of numbers" .)

I've seen this clue in The Irish Independent.
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