Somewhat misdescribe anodyne celebration (5)
I believe the answer is:
beano
'celebration' is the definition.
(I've seen this before)
'somewhat misdescribe anodyne' is the wordplay.
'somewhat' indicates the answer is hidden within the clue.
'BEANO' is hidden within 'misdescribe anodyne'.
(Other definitions for beano that I've seen before include "Junket - children's comic" , "A bone for a feast" , "rowdy festivity" , "Kids' comic" , "Enjoyable party" .)