Brunch quaff (6)
I believe the answer is:
mimosa
'brunch quaff' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for mimosa that I've seen before include "So maim with tropical shrub bearing fragrant flowers" , "Australian acacia tree" , "Tropical plant" , "Tropical tree or shrub with clusters of fragrant flowers" , "Sensitive thing growing" .)