Bloomer, or catastrophe to pull out police officers? (5)
I believe the answer is:
aster
'bloomer' is the definition.
(aster is a kind of flowering plant)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for aster that I've seen before include "Tears (anag) - plant" , "bloomer" , "(Starlike) flower" , "Flowering plant; tares (anag.)" , "eg Michaelmas daisy" .)