South Island style of diving! (5)

I believe the answer is:

scuba

I'm a little stuck... Click here to teach me more about this clue!

'style of diving' is the definition.
'scuba' can be an answer for 'diving'. I'm not certain of the 'style of' bit.

'south island' is the wordplay.
'south' becomes 's' ('S' can be a synonym of 'south').
'island' becomes 'cuba' (Cuba is an example).
's'+'cuba'='SCUBA'

Can you help me to learn more?

(Other definitions for scuba that I've seen before include "Sort of diver" , "Diving equipment" , "breather" , "Aqualung" , "Skin-diving apparatus" .)

I've seen this clue in the Evening Standard.

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