Element put away, little one (7)
I believe the answer is:
neonate
'little one' is the definition.
(very young baby)
'element put away' is the wordplay.
'element' becomes 'neon' (neon is a kind of element).
'put away' becomes 'ate' (put away can mean to eat).
'neon'+'ate'='NEONATE'
(Other definitions for neonate that I've seen before include "Being recently created" , "Young baby" , "Recently born child" , "Newborn baby" , "produced baby" .)