Revolve a pointed pin (4)

I believe the answer is:

spin

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'revolve' is the definition.
(I know this)

'a pointed pin' is the wordplay.
'a pointed' becomes 's' (I can't justify this - if you can you should believe this answer much more).
's'+'pin'='SPIN'

Can you help me to learn more?

(Other definitions for spin that I've seen before include "Move as a top" , "Twist - creative media relations" , "Turn - type of New Labour doctor" , "Give it a whirl" , "Rotate on pins" .)

I've seen this clue in The Irish News.

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