Crossword Genius

One way, on a horse or marching (8)

Ross

I believe the answer is:

striding

'marching' is the definition.
('stride' can be a synonym of 'march')

'one way on a horse' is the wordplay.
'one way' becomes 'st' (abbreviation for street).
'on a horse' becomes 'riding' (I've seen this before).
'st'+'riding'='STRIDING'

'or' acts as a link.

(Other definitions for striding that I've seen before include "Walking with long steps" , "edge of the Lake District" , "Stepping out" .)

I've seen this clue in the Sydney Morning Herald.
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