The yoke's on them (6)

I think it could be either:

Which length description are you looking for?:

oxen

'the yoke's on them' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for oxen that I've seen before include "Steers" , "Domestic bovines" , "Domesticated bovine draft animals" , "Horned farm animals" , "Doctored bulls" .)

I've seen this clue in the Penny Press.

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