Giver makes new entrance outside (5)
I believe the answer is:
donor
'giver' is the definition.
('donor' can be a synonym of 'giver')
'new entrance outside' is the wordplay.
'new' becomes 'n'.
'entrance' becomes 'door' (door is a kind of entrance).
'outside' indicates putting letters inside.
'n' put inside 'door' is 'DONOR'.
'makes' is the link.
(Other definitions for donor that I've seen before include "A giver, perhaps of blood" , "contributor" , "blessed person, relatively" , "One who gives something" , "A giver, often of blood" .)