Good animals on way back showing rapacity (5)
I believe the answer is:
greed
'rapacity' is the definition.
('greed' can be a synonym of 'rapacity')
'good animals on way back' is the wordplay.
'good' becomes 'g' (abbreviation).
'animals' becomes 'deer'.
'on way back' says the letters should be written backwards.
'deer' back-to-front is 'reed'.
'g'+'reed'='GREED'
'showing' acts as a link.
(Other definitions for greed that I've seen before include "sin" , "Voracity" , "Rapacious desire" , "Circuit" , "Selfish desire" .)