Source (4)
'source' is the definition.
(both can mean the origin of something)
This is the entire clue.
(Other definitions for root that I've seen before include "Turn up with the snout." , "Origin; eg, carrot" , "Rhizome" , "Rummage, origin" , "Lowest part of plant" .)
'source' is the definition.
(I know that source can be written as seed)
This is all the clue.
(Other definitions for seed that I've seen before include "Pip; tennis player" , "What is sown" , "Pip for sowing" , "One of the outstanding players in a tournament" , "one of the top players" .)
'source' is the definition.
(I know that source can be written as origin)
This is the entire clue.
(Other definitions for origin that I've seen before include "extraction" , "Where axes cut" , "For a start" , "Starting point or cause" , "First thing" .)