Long steps (7)
I believe the answer is:
strides
'long steps' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for strides that I've seen before include "Trousers; long steps" , "Paces -- trousers" , "pants [STRINE]" , "Walks, trousers (colloq.)" , "Bags" .)