Clumsy: presumably good for hitches ? (3,6)
I believe the answer is:
all thumbs
'clumsy' is the definition.
(thesaurus)
I cannot understand how the remainder of the clue works.
(Other definitions for all thumbs that I've seen before include "ham-fisted" , "Very clumsy due to hand deformities" , "Manually clumsy, fingers too short and thick" , "Manually clumsy from digital aberration" , "Manually clumsy, too many large digits" .)