Member, notice, with poorly old animal (9)
I believe the answer is:
armadillo
'animal' is the definition.
(armadillo is a kind of animal)
'member notice with poorly old' is the wordplay.
'member' becomes 'arm' (member can mean a limb).
'notice' becomes 'ad' (short for advert).
'with' says to put letters next to each other.
'poorly' becomes 'ill' (synonyms).
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'arm'+'ad'+'ill'+'o'='ARMADILLO'
(Other definitions for armadillo that I've seen before include "S. Am. plated mammal" , "Small burrowing S American animal covered with bony plates" , "Mammal covered with bony plates" , "Horny-plated creature" , "Toothless Native American" .)