Animal has morning in a pound (4)
I believe the answer is:
lamb
'animal' is the definition.
(lamb is a kind of animal)
'morning in a pound' is the wordplay.
'morning' becomes 'am'.
'in' is an insertion indicator.
'a pound' becomes 'lb' ('lb' can be a synonym of 'pound').
'am' going into 'lb' is 'LAMB'.
'has' acts as a link.
(Other definitions for lamb that I've seen before include "English essayist" , "author?" , "Writer" , "Charles ---, essayist; meek animal" , "Young sheep" .)