Good animals on way back showing rapacity (5)
I believe the answer is:
Here is my best explanation:
'rapacity' is the definition.
('greed' can be a synonym of 'rapacity')
'good animals on way back' is the subsidiary indication.
'good' becomes 'g' (abbreviation).
'animals' becomes 'deer'.
'on way back' says the letters should be written backwards.
'deer' written backwards gives 'reed'.
'showing' is the link.
(Other definitions for greed that I've seen before include "Rapacity", "sin", "vice", "Rapacious desire", "selfish habit", "Selfish desire", "Insatiability", "Covetousness", "Cupidity" and "covetousness".)