Fewer found in animal (3)
I believe the answer is:
ewe
'animal' is the definition.
(female sheep)
'fewer found' is the wordplay.
'found' indicates a hidden word.
'EWE' is hidden within 'fewer'.
'in' is the link.
(Other definitions for ewe that I've seen before include "Wool supplier" , "Female animal" , "Female on farm" , "Directions" , "One looking sheepish" .)