Device to acquire after good commercial (6)
I believe the answer is:
gadget
'device' is the definition.
(gadget is a kind of device)
'acquire after good commercial' is the wordplay.
'acquire' becomes 'get' (synonyms).
'after' is a charade indicator (letters next to each other).
'good' becomes 'g' (abbreviation).
'commercial' becomes 'ad' (abbreviation for advertisement).
'g'+'ad'='gad'
'get' after 'gad' is 'GADGET'.
'to' acts as a link.
(Other definitions for gadget that I've seen before include "Device or invention" , "Gismo" , "Small mechanical device or tool" , "Clever device" , "Handy device" .)