Get on at summit (5)

I believe the answer is:

mount

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'get on' is the definition.
(synonyms)

I can't explain the remainder of the clue.

(Other definitions for mount that I've seen before include "stage" , "Climb - Everest, for example" , "Get upon" , "Ascend; horse" , "hill" .)

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

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