Horned pachyderm (5)
I believe the answer is:
rhino
'horned pachyderm' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for rhino that I've seen before include "Horned ungulate" , "Beastly type that could charge you" , "African/Asian ungulate" , "greens" , "Moola" .)