Dull sort of crossing (10)
I believe the answer is:
pedestrian
This clue is a double definition.
'dull' is the first definition.
('pedestrian' can be similar in meaning to 'dull')
'sort of crossing' is the second definition.
(Other definitions for pedestrian that I've seen before include "Walker; prosaic" , "Hiker" , "Dull; walker" , "How commonplace" , "nothing much to write home about" .)