Trips over some galvanised iron (5)
I believe the answer is:
rides
'trips' is the definition.
(I've seen this before)
'over some galvanised iron' is the wordplay.
'over' is a reversal indicator.
'some' says the answer is hidden in the clue (some parts of the word are used).
'sedir' is hidden within 'galvanised iron'.
'sedir' backwards is 'RIDES'.
(Other definitions for rides that I've seen before include "Travels on something" , "Goes on a horse" , "Dries up and travels" , "Journeys by horse or bicycle" , "Travels on, horse say" .)