Made smaller (8)
'made smaller' is the definition.
(reducing is a kind of making smaller)
This is all the clue.
(Other definitions for reduced that I've seen before include "Curtailed" , "Lessened" , "Made smaller" , "Got rid of some bodily weight" , "Abridged" .)
'made smaller' is the definition.
('lessen' can be a synonym of 'make smaller')
This is the entire clue.
(Other definitions for lessened that I've seen before include "belittled" , "Needless (anag.)" , "Diminished, decreased" , "cut" .)