Separable clothes horse (4)
I believe the answer is:
arab
'horse' is the definition.
(Arab is an example)
'separable clothes' is the wordplay.
'clothes' indicates the answer is hidden within the clue (the letters clothe the hidden word).
'ARAB' is hidden in the letters of 'separable'.
(Other definitions for arab that I've seen before include "Qatari or Omani, say" , "Saudi, perhaps - breed of horse" , "Someone from the Middle East or North Africa, perhaps" , "Semite" , "One from Saudi" .)