Old horse's kick (4)

I believe the answer is:

hack

I believe this clue is a double definition.

'old horse's' is the first definition.
(hack can mean an old horse)

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

(Other definitions for hack that I've seen before include "Cut crudely - journalist" , "Put up with" , "Cut - mediocre journalist" , "Chop roughly - mediocre journalist" , "Chop - reporter" .)

I've seen this clue in The Guardian.

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