Crossword Genius

Remove ties from hunting hound repeatedly, not good (4)

Ross

I believe the answer is:

undo

I'm a little stuck... Click here to teach me more about this clue!

'remove ties' is the definition.

'from hunting hound repeatedly not good' is the wordplay.
I cannot really see how this works, but
'from' could be 'o' (I've seen this in other clues) and 'o' is located in the answer.
'not' could be 'un' (I've seen this in other clues) and 'un' is found in the answer.
A single letter 'd' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for undo that I've seen before include "Wreck" , "(4)" , "Ruin prospects of; cancel" , "Relax" , "Untie, loosen" .)

I've seen this clue in The Everyman puzzle in The Observer.
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