Takes off bloomers after a day (9)
I believe the answer is:
Here is my best explanation:
'takes off' is the definition.
'bloomers after a day' is the wordplay.
'bloomers' becomes 'irises'.
'after' is a charade indicator (letters next to each other).
'a day' becomes 'sat' (I've seen this before).
'irises' after 'sat' is 'SATIRISES'.
(Other definitions for satirises that I've seen before include "Makes exaggerated attacks", "Sends up", "Makes fun of" and "Ridicules".)