Good commercial: purchase device (6)

I believe the answer is:

gadget

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'device' is the definition.
(I know that gadget is a type of device)

'good commercial purchase' is the wordplay.
'good' becomes 'g' (abbreviation).
'commercial' becomes 'ad' (abbreviation for advertisement).
'purchase' becomes 'get' (I am not sure about this - if you are sure you should believe this answer much more).
'g'+'ad'+'get'='GADGET'

Can you help me to learn more?

(Other definitions for gadget that I've seen before include "Gismo" , "Tagged (anag.)" , "Small mechanical device or tool" , "Nifty device" , "Ingenious little device" .)

I've seen this clue in The Sun.

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