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.
But, I'm 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" .)