Dodgy dealing pacts reap rich changes (5,8)
I believe the answer is:
sharp practice
'dodgy dealing' is the definition.
I know nothing about this answer so I can't judge whether this works.
'pacts reap rich changes' is the wordplay.
'changes' indicates an anagram.
'pacts'+'reap'+'rich'='pactsreaprich'
'pactsreaprich' anagrammed gives 'SHARP PRACTICE'.
Can you help me to learn more?
(Other definitions for sharp practice that I've seen before include "Dishonesty" , "Dishonest dealings" , "cheating" , "Dodgy dealings" , "Ethically dubious machination" .)