Not slow to get a new purse with new coins (10)

I believe the answer is:

supersonic

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'not slow to' is the definition.
I can't tell whether this definition defines the answer.

'a new purse with new coins' is the wordplay.
'a new' indicates anagramming the letters.
'with' means one lot of letters go next to another.
'new' is an anagram indicator.
'purse' with letters rearranged gives 'super'.
'coins' with letters rearranged gives 'sonic'.
'super'+'sonic'='SUPERSONIC'

'get' acts as a link.

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(Other definitions for supersonic that I've seen before include "Very fast - 11 (anag)" , "moving very fast" , "Faster than Mach 1" , "Faster than the speed of sound" .)

I've seen this clue in The Globe and Mail.

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