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Try to get a free ride because of setback (5)

Ross

I believe the answer is:

hitch

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'setback' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

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(Other definitions for hitch that I've seen before include "Unforeseen obstacle" , "Unexpected problem" , "Temporary problem" , "Marry" , "To travel without paying" .)

I've seen this clue in The Irish Times.
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