Crossword Genius

A donkey, virtually wild (4)

Ross

I believe the answer is:

amok

'wild' is the definition.
(eg running amok is running wild)

'a donkey virtually' is the wordplay.
'donkey' becomes 'moke' (moke can informally mean a donkey).
'virtually' means to remove the last letter (all but the last letter).
'moke' with its last letter removed is 'mok'.
'a'+'mok'='AMOK'

(Other definitions for amok that I've seen before include "crazy" , "Berserk" , "In an uncontrolled, often violent, way" , "(Run) in murderous frenzy" , "Wild and uncontrollable" .)

I've seen this clue in The Guardian.
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