Chant along with say, greed is good (4)
I believe the answer is:
sing
'chant' is the definition.
(chant can mean to sing)
'along with say greed is good' is the wordplay.
'along with' says to put letters next to each other.
'say greed' becomes 'sin' (I can't explain this - if you can you should give a lot more credence to this answer).
'is good' becomes 'g' (abbreviation).
'sin'+'g' is 'SING'.
Can you help me to learn more?
(Other definitions for sing that I've seen before include "Inform - carol" , "serenade" , "Warble" , "Grass" , "Act as informer" .)