It may bring a smashing return! (3)
I believe the answer is:
lob
'return' is the definition.
(lob is a kind of return)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for lob that I've seen before include "Toss" , "Propel in a high arc" , "Elevated shot" , "Tennis shot" , "Lofted ball" .)