Made error accommodating ruminant animal (4)
I believe the answer is:
deer
'ruminant animal' is the definition.
'made error accommodating' is the wordplay.
'accommodating' indicates a hidden word.
'DEER' is hidden in the letters of 'made error'.
(Other definitions for deer that I've seen before include "Like a power switch" , "Bucks and does?" , "Perhaps fallow" , "Ruminant(s) -- breed of 13 down" , "Hoofed animals" .)