Crossword Genius

Urge on (5)

Ross

There are a few possibilities for this:

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3

4

5 3,2

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

This is all the clue.

(Other definitions for spur that I've seen before include "Goad, prod" , "Sharply pointed projection" , "railway siding" , "Goad - branch line" , "Goad - incentive" .)

I've seen this clue in the LA Times, the Sydney Morning Herald and the Newsday.
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