Wrong taming, due to size (9)
I believe the answer is:
magnitude
'to size' is the definition.
(I've seen this before)
'wrong taming due' is the wordplay.
'wrong' is an anagram indicator.
'taming'+'due'='tamingdue'
'tamingdue' is an anagram of 'MAGNITUDE'.
(Other definitions for magnitude that I've seen before include "Eating mud (anag.)" , "(A star's) brightness" , "Dimensions" , "Relative importance" , "Largeness or size" .)