Stop running studhorse without one leg (5)

I believe the answer is:

stall

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

I don't understand the remainder of the clue.

(Other definitions for stall that I've seen before include "Section of a stable and theatre" , "(Of engine) stop running; booth" , "A stand in a market-place" , "Market stand; delay" , "Equivocate" .)

I've seen this clue in The Times.

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