Tells horse to stop in distress (3)

I believe the answer is:

woe

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'distress' is the definition.
(I have seen 'Great distress ' mean 'woe' so perhaps 'distress' could also mean 'woe')

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for woe that I've seen before include "Trouble" , "Tale content?" , "Great sorrow, distress" , "Misery, wretchedness" , "Difficulty" .)

I've seen this clue in The Irish Times.

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