Quick way to get fit, perhaps (5)

I believe the answer is:

swift

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'quick' is the definition.
(I've seen this before)

'way to get fit perhaps' is the wordplay.
'way to get' becomes 'sw' (I can't explain this - if you can you should believe this answer much more).
'perhaps' indicates anagramming the letters.
'fit' is an anagram of 'ift'.
'sw'+'ift'='SWIFT'

Can you help me to learn more?

(Other definitions for swift that I've seen before include "Large property" , "Happening quickly; author" , "Quick - writer" , "Quick, prompt" , "Quick Irish satirist?" .)

I've seen this clue in the Evening Standard.

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