Australian longs for progress (7)
I believe the answer is:
strides
I believe this is a double definition.
'australian longs' is the first definition.
(Aussie slang for longs ie trousers)
'progress' is the second definition.
(I've seen this in another clue)
'for' acts as a link.
(Other definitions for strides that I've seen before include "Walks with long paces" , "pants [STRINE]" , "Trousers; long steps" , "footsteps" , "Takes great steps" .)