Alter reforms attached to Conservative business association (6)
I believe the answer is:
cartel
'business association' is the definition.
'cartel' can be an answer for 'association' (cartel is a kind of association). I'm not certain of the 'business' bit.
'alter reforms attached to conservative' is the wordplay.
'reforms' is an anagram indicator.
'attached to' means one lot of letters go next to another.
'conservative' becomes 'c' (UK political abbreviation).
'alter' with letters rearranged gives 'artel'.
'artel' put after 'c' is 'CARTEL'.
Can you help me to learn more?
(Other definitions for cartel that I've seen before include "Market-controlling arrangement" , "Business syndicate in claret" , "Protective trade ring for claret" , "Producers' conspiracy" , "Restrictive manufacturers' association" .)