Clodhopper Garbo bungled lead in Ninotchka (6)
I believe the answer is:
brogan
'clodhopper' is the definition.
('brogan' can be a synonym of 'clodhopper')
'garbo bungled lead in ninotchka' is the wordplay.
'bungled' indicates anagramming the letters.
'lead in' says to take the initial letters.
The initial letter of 'ninotchka' is 'n'.
'garbo' is an anagram of 'broga'.
'broga'+'n'='BROGAN'
(Other definitions for brogan that I've seen before include "Clodhopper" , "article of footwear" .)