Finished removing new creature (3)
I believe the answer is:
doe
'creature' is the definition.
(doe is a kind of animal)
'finished removing new' is the wordplay.
'finished' becomes 'done' (similar in meaning).
'removing' suggests deleting specific letters.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'done' with 'n' taken out is 'DOE'.
(Other definitions for doe that I've seen before include "Feminine counterpart of stag" , "She eats vegetarian food" , "Rabbit, perhaps" , "She's a deer" , "possible mate for Rudolph?" .)