Sixth or seventh extract for animal (5)
I believe the answer is:
horse
'for animal' is the definition.
(type of animal)
'sixth or seventh extract' is the wordplay.
'HORSE' is hidden within the letters.
However, I am uncertain how this is indicated.
Can you help me to learn more?
(Other definitions for horse that I've seen before include "Equipment in gym" , "Equid" , "drug?" , "Shore (anag)" , "This common sense is of equine origin" .)