Crossword Genius

What a skindiver uses in South Island (5)

Ross

I believe the answer is:

scuba

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

'what a skindiver uses' is the definition.
I can't tell whether this definition defines the answer.

'south island' is the wordplay.
'south' becomes 'S' (synonyms).
'island' becomes 'cuba' (Cuba is an example).
's'+'cuba'='SCUBA'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for scuba that I've seen before include "breather" , "Diving equipment" , "Aqualung" , "Device that lets divers breathe under water" , "Self-contained underwater breathing apparatus (acronym)" .)

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