Stimulating drug reduced - a kind of blow (8)
I believe the answer is:
uppercut
'a kind of blow' is the definition.
(I know that uppercut is a type of blow)
'stimulating drug reduced' is the wordplay.
'stimulating drug' becomes 'upper' (a type of stimulating drug. I am not sure about the 'stimulating' bit.).
'reduced' becomes 'cut' (similar in meaning).
'upper'+'cut'='UPPERCUT'
Can you help me to learn more?
(Other definitions for uppercut that I've seen before include "Type of punch" , "Swinging blow in boxing" , "Part of boxer's repertoire" , "Swinging blow directed at an opponent's chin" , "Boxer's blow" .)