Oddly amusing or comical (5)
I believe the answer is:
droll
I believe this clue is a double definition.
'oddly amusing' is the first definition.
(I've seen this before)
'comical' is the second definition.
(I've seen this before)
(Other definitions for droll that I've seen before include "Whimsically comical" , "Large amount (of matter)" , "Humorous or whimsical" , "Dry" , "Funny" .)