Stumbling block (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
hitch
'stumbling block' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for hitch that I've seen before include "Snag; tie up (animal)" , "To travel without paying" , "Yank" , "Temporary problem" , "Temporary obstacle" .)