Generated (6)
'generated' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for bred that I've seen before include "Propagated, raised" , "Brought up (to behave in particular way)" , "Brought up, propagated" , "did produce issue" , "Had children" .)
(Other definitions for caused that I've seen before include "Gave rise to" , "Brought about" , "Made happen" , "Produced as an effect" .)
(Other definitions for produced that I've seen before include "Made or gave rise to" , "Brought about, yielded" , "Made or presented something" , "Bore" .)