Bully ties elastic around dropped brick? (9)
I believe the answer is:
terrorise
'bully' is the definition.
(terrorise can mean to bully or antagonise)
'ties elastic around dropped brick?' is the wordplay.
'elastic' is an anagram indicator (the anagram stretches or twists into a new form).
'around' indicates putting letters inside.
'dropped brick?' becomes 'error' (to drop a brick is to make an embarrassing mistake).
'ties' with letters rearranged gives 'tise'.
'tise' placed around 'error' is 'TERRORISE'.
(Other definitions for terrorise that I've seen before include "Frighten or menace like roisterer" , "Browbeat, bully" , "generate fear" , "Oppress by fear" , "Spook" .)