One up on a soap box or a hill (6)

I believe the answer is:

orator

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'one up on a soap box' is the definition.
I can't tell whether this definition defines the answer.

'or a hill' is the wordplay.
'hill' becomes 'tor' (tor is a kind of hill).
'or'+'a'+'tor'='ORATOR'

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(Other definitions for orator that I've seen before include "A Rhetorical talker or speech-maker" , "A fluent public speaker" , "I declaim" , "Eloquent type" , "One addressing" .)

I've seen this clue in the Evening Standard.

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