Germs (5)
(Other definitions for bacteria that I've seen before include "Microscopic organisms, may carry diseases" , "Cabaret I perform badly for the tiny organisms" , "Tiny organisms, may be good or bad" , "Single-celled microorganisms" , "These single-cell organisms are in bait race" .)
'germs' is the definition.
('seed' can be a synonym of 'germ')
This is the entire clue.
(Other definitions for seeds that I've seen before include "nuts" , "Small hard fruit" , "Pips" , "top tennis players" , "Initiates the growth of" .)