Keeper (8)
'keeper' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for guardian that I've seen before include "Defender, protector" , "One in loco parentis" , "Daily newspaper" , "Curator" , "Platonic leader" .)
'keeper' is the definition.
(I know that keeper can be written as custodian)
This is all the clue.
(Other definitions for custodian that I've seen before include "Protector/guardian (of something)" , "Protector" , "Guardian" , "One takes care of" , "museum keeper" .)