Excessive, unwarranted (5)
I believe the answer is:
undue
I believe this clue is a double definition.
'excessive' is the first definition.
(I know that excessive can be written as undue)
'unwarranted' is the second definition.
(I know that unwarranted can be written as undue)
(Other definitions for undue that I've seen before include "Improper" , "Not warranted" , "Needless; excessive" , "Excessive - unwarranted" , "Excessive, disproportionate" .)