Group of companies colluding to move and sell essentials (6)
I believe the answer is:
cartel
'group of' is the definition.
'cartel' can be an answer for 'group' (thesaurus). I am not certain of the 'of' bit.
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for cartel that I've seen before include "Business syndicate in claret" , "Group that agrees fixed prices to limit competition" , "Protective trade ring for claret" , "Restrictive trade group" , "Market-controlling arrangement" .)