Quick trip around Spanish Main (4)

I believe the answer is:

spin

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'quick trip' is the definition.
(I've seen this in another clue)

'spanish main' is the wordplay.
'spanish' becomes 'sp'.
'main' becomes 'in' (I can't explain this - if you can you should believe this answer much more).
'sp'+'in'='SPIN'

'around' acts as a link.

Can you help me to learn more?

(Other definitions for spin that I've seen before include "Rotate repeatedly" , "Move as a top" , "Massaging of news" , "some doctors deal with" , "Misleading slant on news" .)

I've seen this clue in The Irish Times.

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