Kangaroo eating large flower (7)
I believe the answer is:
bloomer
'flower' is the definition.
(I know that bloomer is a type of flower)
'kangaroo eating large' is the wordplay.
I cannot really understand how this works, but
'large' could be 'l' (eg in clothes sizes) and 'l' is present in the answer.
The remaining letters 'boomer' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for bloomer that I've seen before include "rose, say" , "Stupid mistake" , "Loaf of bread" , "Big mistake" , "Mistake (colloq.), loaf" .)