Give speech from south summit (5)

I believe the answer is:

speak

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'give speech from' is the definition.
I can't tell whether this defines the answer.

'south summit' is the wordplay.
'south' becomes 'S' (abbreviation).
'summit' becomes 'peak' (mountain peak).
's'+'peak'='SPEAK'

Can you help me to learn more?

(Other definitions for speak that I've seen before include "Say something" , "express" , "Utter words" , "Converse" , "Orate" .)

I've seen this clue in The Sun.

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