Flowers I dropped in heaving boutique (7)
I believe the answer is:
bouquet
'flowers' is the definition.
(a bunch of flowers)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for bouquet that I've seen before include "Flower arrangement" , "Wine perfume" , "Floral presentation" , "gets right up the wine taster's nose" , "Wine's aroma" .)