Cattle and horses registered in Duke's place (6)
I believe the answer is:
steers
'cattle' is the definition.
(I've seen this in another clue)
'horses registered in duke's place' is the wordplay.
I cannot quite see how this works, but
'registered' could be 'r' (abbreviation, as in registered trademark) and 'r' is found within the answer.
'place' could be 'tee' (tee is a kind of place) and 'tee' is found in the answer.
This explanation may well be incorrect...
'and' is the link.
Can you help me to learn more?
(Other definitions for steers that I've seen before include "Determines the direction" , "Directs, maneouvres" , "Guides the bullocks" , "drives" , "Controls the direction" .)