Level hit or zonal redistribution (10)

I believe the answer is:

horizontal

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'level' is the definition.
(similar in meaning)

'hit or zonal redistribution' is the wordplay.
'hit or zonal' anagrams to 'HORIZONTAL'.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for horizontal that I've seen before include "even" , "What this answer isn't!" , "Lying flat" , "Prone" .)

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

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