Are staggering around the street making a bloomer (5)
I believe the answer is:
Here is my best explanation:
'a bloomer' is the definition.
(aster is a kind of flowering plant)
'are staggering around the street' is the subsidiary indication.
'staggering' is an anagram indicator.
'around' is an insertion indicator.
'the street' becomes 'st'.
'are' with letters rearranged gives 'aer'.
'aer' enclosing 'st' is 'aster'.
'making' is the link.
(Other definitions for aster that I've seen before include "Daisy-like garden flower", "Flowering plant; tares (anag.)", "Stare oddly at the flower", "Christmas daisy", "Daisy plant", "Garden plant", "eg Michaelmas daisy", "Plant like a Michaelmas daisy", "Tears (anag) - plant" and "Garden flower".)