Engender (5)
'engender' is the definition.
(synonyms)
This is all the clue.
(Other definitions for beget that I've seen before include "Engender" , "Father" , "Give rise to; create (children)" , "Sire" , "Produce (child) (archaic)" .)
(Other definitions for spawn that I've seen before include "Eggs deposited by fish" , "Eggs of fish, frogs, etc" , "Deposit mass of eggs" , "Give rise to; frogs' eggs" , "set off" .)
'engender' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for inbreed that I've seen before include "Mate with close relatives" , "keep it in the family?" , "reproduce with relatives" , "Produce offspring fro m closely related stock" .)