Stranger took the top off cattle feed (5)

I believe the answer is:

odder

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'stranger' is the definition.
(more odd)

I can't explain the rest of the clue.

(Other definitions for odder that I've seen before include "more rum" , "More unusual" , "More strange or less even" , "More peculiar" , "Stranger" .)

I've seen this clue in the Sydney Morning Herald.

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