PC way to trade green car adopted by setter (1-8)
I believe the answer is:
e-commerce
'pc way to trade' is the definition.
(way to trade using a PC)
'green car adopted by setter' is the wordplay.
'green' becomes 'eco' (abbreviation for ecological).
'car' becomes 'merc' (short for Mercedes).
'adopted by' indicates putting letters inside (I've seen this in other clues).
'setter' becomes 'me' (the setter of the clue).
'merc' put into 'me' is 'mmerce'.
'eco'+'mmerce'='E-COMMERCE'
(Other definitions for e-commerce that I've seen before include "Business conducted via the internet" , "Online trading" , "Internet trade" , "Transactions conducted on the internet" .)