Crossword Genius

Blame leader having quit platform (5)

Ross

I believe the answer is:

odium

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for odium that I've seen before include "Widespread hatred or abhorrence (5)" , "disapprobation" , "Widespread hatred or disgust felt towards person" , "General dislike" , "General hatred or disgust" .)

I've seen this clue in The Telegraph.
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